Info plugin: allow xhtml renders to not to be an xhtml renderer

Renderers that set the format to xhtml don't necessarily inherit from
Doku_Renderer_xhtml, this reverts a prior change that introduced

Info plugin: allow xhtml renders to not to be an xhtml renderer

Renderers that set the format to xhtml don't necessarily inherit from
Doku_Renderer_xhtml, this reverts a prior change that introduced the
stricter parameter type.

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comment improvements

translation update

replace boolean conditional checks on possibly uninitialized vars with \!empty/empty/isset as appropriate

translation update

fix signature mail unittest, and improve some signatures info plugin

fix expression passed by reference

fix signatures and old by references

fix php strict notices

compact some CSS styles to their shorthand syntax FS#2509

Fix PHP strict messages

Put syntax modes in a table layout, sort numbers in rowspans. Implements FS#2516

add PHPDocs to popularity plugin helper

get version popularity plugin direct from plugin info

acl ajax: add messages to returns

acl ajax: replace die() by return

Code reformatting and remove unused global conf

remove unused variable

move ajax.php to action.php. Fixes FS#2233

translation update

typo fix PR #368

removed css_moveimports() this is now done by lessphp

add cookie secure parameter to cookies set by javascript

translation update

translation update