xml compatibility fixes (mainly entities to unicode conversions)

updated: Bulgarian translation

added forgotten deprecated comment to userrtl.css in config cascade

improved preview to have same width as resulting page if it would have a sidebar

Improved sidebar inclusion

Template authors now can use tpl_sidebar() to include the sidebar.
Sidebars can be defined in subnamespaces as well

added missing underscore to replaced char class chars

do not use char class in Mailer header cleaning

\w could match multibyte chars depending on system setup

make MD5 crypt without salts always use PHP implementation

crypt seems to behave different on different systems when the salt
is empty.

de/de-informal: added missing localization / update existing ones

de-informal: Fixed typos "Abonnementliste" (FS#2456)

iRussian language update

fixed ACL loading after the recent changes/messup

fixed group wildcards and added tests

removed another occurance of the obsolete config option

simplified %GROUP% wildcard support

Input wrapper for html forms

Input validation for media manager

treat empty string inputs as unset for int and bool

Avoid timeout when content-length is 0

Limit size of reads when max_bodysize is set or content-length is present

more INPUT wrapper uses: cache purge, sectok, getID

Input wrapper for action.php

some code cleanup and php docs

some Input class fixes and unit tests

Input wrapper for auth.php