do not disclose email or IP addresses of users through RSS

The feed used to add real or fake email addresses to items (because some
feed formats require them). The default RSS1.0 format did not show

do not disclose email or IP addresses of users through RSS

The feed used to add real or fake email addresses to items (because some
feed formats require them). The default RSS1.0 format did not show them,
but that changed in the recent update of our FeedCreator classes.

Now all code for that has been removed, always showing an
@undisclosed.example.com email address. Because some feed readers may
use the email address to distinguis authors, the mechanism to prepend
the user name was kept.

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response on review

small fix

prevent hidden pages to be shown in trace

Make default encapsulation more readable and less duplicate.

Replace htmlspecialchars to hsc in core

Add the preview-bool for the cache file.

Add htmlspecialchars when showing $DATE_AT

Fixes #2061

#2021 broken links to W3C validators
also dokuwiki and php are on https

response on review

cleaning

extracted functions
added test coverage

made bin/wantedpage.php more flexible

* results can be sorted by wanted or origin
* second dimension can be skipped
* results should be easier to parse with standard unix tools now
* use proper otpi

made bin/wantedpage.php more flexible

* results can be sorted by wanted or origin
* second dimension can be skipped
* results should be easier to parse with standard unix tools now
* use proper otpions, not commands

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doc abbreviation

Fix PHP Notices: Reduce error log noise

While DokuWiki suppresses PHP Notices they are still a code smell and
should be fixed. This fixes some PHP Notices that occurred.

Some of these fixes could b

Fix PHP Notices: Reduce error log noise

While DokuWiki suppresses PHP Notices they are still a code smell and
should be fixed. This fixes some PHP Notices that occurred.

Some of these fixes could be refactored into nicer code once we move to
PHP 7 and get access to the `??` operator.

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Create valid empty options

The HTML-spec[0] specifies:

> If the element has no label attribute and is not a child of a datalist element: Text that is not inter-element whitespace.

So a non-breakin

Create valid empty options

The HTML-spec[0] specifies:

> If the element has no label attribute and is not a child of a datalist element: Text that is not inter-element whitespace.

So a non-breaking space is valid solution.

[0] https://html.spec.whatwg.org/multipage/form-elements.html#the-option-element

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allow tests against ajax requests

cleaning after better understanding of the surroundings

back slashes in @import

cleaning

fix tests on windows

translation update

doc fix

translation update

using $options->getCmd to retrieve show-pages parameter