make sure zlib exists when trying to use gzip_output #1410

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Deactivate XSS-Protection during preview

The motivation is to work around/fix issue #1182.

Using a CSP-Header did not work.

ToDo:
- [ ] Implement a check for Chrome only.

fix typo in German translation

fix error

Optimizations to autoloader

Autoloader should return true if it can handle the class so other registered autoloader don't execute.
require is faster than require_once and should be safe to use sinc

Optimizations to autoloader

Autoloader should return true if it can handle the class so other registered autoloader don't execute.
require is faster than require_once and should be safe to use since the autoloader won't run if the class already exists

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Add an ACL check in page_findnearest, fix #1369

This means that templates that use this function will no longer display
pages like sidebars that can't be accessed by the current user.

add convenience function for empty check without 0

This allows to quickly check if a variable is empty but keeps strings
and numbers evaluating to zero.

Use empty instead of isset, due REMOTE_USER should not be empty.

TagCloseElements conform to inherited expectations

Throwing an exception on request for an id or attribute breaks several
functions like $form->findPositionByAttribute.

See issue #1312

Fixed undefined error in html_denied()

sort admin plugins alphabetically

Sorting by the sort number is too confusing since those are assigned
independently by different authors

Fixed undefined offset on $last_ope

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Fixed several undefined errors.

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add sizechange to wiki's global recent page