fix some Only vars assigned by reference

fixed some errors indicated by IDEA

fix signature mail unittest, and improve some signatures info plugin

output of fread is string, but recognized as object. Fixed assign by ref

fix expression passed by reference

fix signatures and old by references

not assign object from plugin_load by reference

phpdocs plugins util and controller

inc/search.php phpdocs

update phpdocs inc/search.php

improve visibility and PHPdocs of plugin controller

fix php strict and remove double duplicated code of renderer plugin loader

fix php strict notices

Added unit tests for CSS shorthand compression FS#2509

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