Extension manager: First draft of the extension class

add html5 attributes to email fields of the config manager

add html5 'email' type to the user manager forms

FS#2751 - self deletion of user account

Remove search_references() and the refshow configuration option

The refshow configuration option wasn't used as described anymore
already in the latest release and after the introduction of the medi

Remove search_references() and the refshow configuration option

The refshow configuration option wasn't used as described anymore
already in the latest release and after the introduction of the media
usage index the parameter is also no longer relevant for internal
optimization. The only place where it was still used is the no longer
used search_references()-function which is removed here, too.

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added aria attributes to tree and show/hide functions

removed possibility to have rtl.less files in plugins

switched to LESS variables in rest of template's css files

unlessified and lessified a few more css

fixed broken structure

Don't recommend the deprecated default template for JS debugging

removed debug statement. sorry

convert ini replacements to less vars first

This makes it possible to safely overwrite ini replacements from within
any less file

make sure calculations are correct

lessified more files

lessyfied another one

lessyfied the first of template's CSS files

fixed ini replacement to less variables stuff

corrected coding style, deleted ?>, renamed function keys and used plugin_load

moving ACL remote functions to the ACL plugin

add LESS support

still needs testing

Fix popularity data submission in the backend FS#2808

The POST data contained the raw data instead of an array with the data
that should be submitted like in the requests from the browser. The
serve

Fix popularity data submission in the backend FS#2808

The POST data contained the raw data instead of an array with the data
that should be submitted like in the requests from the browser. The
server backend has been fixed to be able to process both versions.

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fixed typo in commented section indenting css

Hungarian language update

Polish language update