Copyright years removed from copyright notices (as discussed on the monthly meeting, so this is the last time we need to spend time on this, sorry about the noise)

[FIX] Improve language strings, including spelling, grammar, natural expressions, consistency, and gender neutrality.

          http://tikiwiki.svn.sourceforge.net/tikiwiki/?rev=44252&view=rev
			 Author:   kstingel
			 Date:     2012-12-11 00:38:31 +0000 (Tue, 11 Dec 2012)
			 Log Message:
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			 [REF] added "@package tikiwiki" page level Docblock, working towards fixing PHPDoc inspection problems

[FIX] svn property keywords in order to have the correct revision information in the heading of all files

[MOD] svn:keywords setting - adding property for keyword Id ($Id: ... $) expansion -- $Header: $ CVS keyword is obsolete, use $Id: $ instead

[MOD] SVN Migration: reorganize the directories structure of the repository after the import made by cvs2svn

(Preliminary note : This is a deep modification in tikiwiki's prefs code. Please test first and send feedback if you can)

 * Now use the $prefs array everywhere (in php files also) instead of global vars. This will :

	- allow to use prefs the same way in smarty and php ($prefs array),

	- simplify all code parts that modifiy a preference, because when a pref is modified in php's $prefs array, it is also up-to-date in smarty $prefs array (everything is passed by reference now). So, no more need to reassign values in smarty each time,

	- avoid duplication of values in memory,

	- reduce risks of errors (e.g. collision in variables names, forget to add one of the "global $prefname", ...)


 * All user prefs are now retrieved in one query at tiki-setup stage (as site prefs) and also in session vars (when sessions are used). This will :

	- reduce overhead and database queries after the first page


 * User prefs are now overriding $prefs. This will :

	- simplify the whole usage of $prefs, because only one array is used (no more need, in general, to use tikilib's functions to get user prefs),

	- set some $prefs['site_*'] (listed in the $user_overrider_prefs array of lib/setup/user_prefs.php) for some specific site prefs that needs to be accessed in php (for example when sending mails) and that could have been overrided with the corresponding user pref