Add test for optgroup support in selects

Add support for optgroup-tags for select-fields

In more complex selects we may want to group options by some criteria.
HTML has the <optgroup>-tag for that purpose.

However in Order to not duplicat

Add support for optgroup-tags for select-fields

In more complex selects we may want to group options by some criteria.
HTML has the <optgroup>-tag for that purpose.

However in Order to not duplicate code, I've to move the handling of
options to the OptGroup-Class completely.

Known Issues:
-------------
* We may have more than one option with the same value and therefore
more than one option may be marked as selected.

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properly initialize LESS importDir. fixes #1777

Remove type-attr from <select> b/c it's invalid

fixes #1776

Test against the current hhvm version

This provides the current HHVM version (3.15.3 as of this PR) and will track with each release (i.e. will be 3.16 when 3.16 is released.

If testing against H

Test against the current hhvm version

This provides the current HHVM version (3.15.3 as of this PR) and will track with each release (i.e. will be 3.16 when 3.16 is released.

If testing against HHVM LST versions is desired follow this guide. https://docs.travis-ci.com/user/languages/php#HHVM-versions

Should be able to change to container based Trusty after Q1-17 https://blog.travis-ci.com/2016-11-08-trusty-container-public-beta/

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use waitForTick in all our tests

refactored the remote API tests

Now each command is checked within it's own test on a completely clean
install. Hopefuly this also takes care of the flaky test behavior seen
at Travis occasionally.

new helper method waitForTick() in DokuWikiTest

Some of our tests require that at least one second has passed before
they can continue because our revisions depend on the Unix Timestamp.

Currently

new helper method waitForTick() in DokuWikiTest

Some of our tests require that at least one second has passed before
they can continue because our revisions depend on the Unix Timestamp.

Currently we use a sleep(1) for this. However this always waits a whole
second, even if the next second is already much closer or maybe already
here - especially when some processing has been done since the last
operation.

This new method waits for the next second by checking the time every
10th of a second. This might speed up some of our tests a bit.

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translation update

we should now be PHP 7.1 compatible

try to fix phpunit version for hhvm

yaml is picky about square brackets

do not try to disable functions on hhvm

this is not supported, yet: https://github.com/facebook/hhvm/issues/2745

updated geshi

do not static cache useheading during tests

This took me way to long to figure out. The useheading setting was
cached in a static variable which is fine usually as it doesn't change
during a single

do not static cache useheading during tests

This took me way to long to figure out. The useheading setting was
cached in a static variable which is fine usually as it doesn't change
during a single request. But in testing we want to change it often.

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fix problems with header that look falsy. fixes #1770

load jquery via https always

split off jquery from other JS and add CDN option #1766

jQuery (and UI and Migrate) are now loaded separately from the rest of
the JavaScript. This adds at least one HTTP request more but has some
a

split off jquery from other JS and add CDN option #1766

jQuery (and UI and Migrate) are now loaded separately from the rest of
the JavaScript. This adds at least one HTTP request more but has some
advantages:

* browsers can cache it independently
* the cache is only invalidated when versions update
* we do not apply any transformations (replacements, minimizing, etc) on
this code anymore which makes our dispatcher faster for the other JS
* browsers seem to load (not execut) both (jquery and other) parallel,
which might increase download speed a bit

This split allowed for the introduction of a new config: jquerycdn. When
enabled the 3 jquery files are loaded from jQueries CDN. This adds
another two HTTP requests but:

* since it's another host those files do not apply to the 4 request per
host limit and can be loaded (not executed) in paralell which might
increase download speeds a bit
* the CDN is distributed worldwide which means files are requested from
the closest location, increasing the download speeds
* since these files/CDN are very popular, chances are high that people
already have them cached in their browsers, reducing the download time
to 0 and effectiely halving the javascript needed to download

The option currently defaults to 'off', but I would argue 'on' would be
the better default.

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use external version file for jquery updates

this also removes the non inified versions and incorporates some updates
the jquery CDN just pushed for jquery-ui

removed jQuery.browser calls

jQuery.browser no longer exists in jQuery nor in jQuery migrate. A quick
check in Opera and IE11 suggests that both parts that used it are no
longer needed so they were

removed jQuery.browser calls

jQuery.browser no longer exists in jQuery nor in jQuery migrate. A quick
check in Opera and IE11 suggests that both parts that used it are no
longer needed so they were simply removed.

More browser tests especially for the resize handling in the media manager
are recommended.

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replace deprecated bind() calls

The bind() call is deprecated in jQuery 3. This replaces it with
the on() call.

replace deprecated delegate() calls

The delegate() call is deprecated in jQuery 3. This replaces it with the
on() call.

fixed radio options in media manager for new jQ-UI

jQuery UI replaced the buttonset widget with a controlgroup widget. This
adjusts the JavaScript and styling accordingly.

jQuery Updates

- jQuery to 3.1.1
- jQuery UI to 1.12.1
- jQuery Migrate to 3.0.0

There are a few warnigs from migrate that have to be fixed. The toggles
in the Media Manager are also missing their

jQuery Updates

- jQuery to 3.1.1
- jQuery UI to 1.12.1
- jQuery Migrate to 3.0.0

There are a few warnigs from migrate that have to be fixed. The toggles
in the Media Manager are also missing their proper icons.

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authpdo - use type safe comparison on passwords. fixes #1765