* introduced config DOC_EDITOR_VCS in conf.inc.php to config Version Control System type (cvs, svn, git...)
* introduced VCSFactory to replace VCS specific operation, user of CvsClient::getInstance is now using VCSFactory::getInstance instead
- VCSFactory::getInstance() has a branching block to obtain DOC_EDITOR_VCS specified VCS-client
* implemented SvnClient
* changed cvsLogin & cvsPasswd & cvsLang in AccountManager to vcsLogin & vcsPasswd & vcsLang (affected JS: ui.component.TranslatorGrid.js)
* install/doc-editor.sql change attributes that involve "cvs" to "vcs"
* File.php cvsDiff is now vcsDiff
* ExtJsController cvsCommit is now vcsCommit (affect JS: ui.task.CVSCommitTask.js)
* Re-activiated cvs commit in CvsClient
* Re-activiated email in AccountManager
* RepositoryManager availableLang is now exposed to public scope
* update error_type.php based on last commit (r284647)
* update scripts/cron/check_build.php based on last commit (r284647)
* update scripts/cron/update_data.php based on last commit (r284647)
* Fixed CvsClient log sending out as associative array that failed ui.component.CVSLogGrid