[#29999] Fix fatal error in JInstallerFile::uninstall(). Thanks Matias
Griese.
[#28714] Authentication - Gmail: Apply Username suffix does not allow
user to login with suffix already applied. Thanks Janich Rasmussen.
[#27709] Saving in backend very slow when many user groups. Thanks Elin.
[#29705] blank login page J3.x beez3.
Update copyright to 2013
Prepare for 2.5.9 release
Fix build to rename update archives
Fix problem in SQL file
Remove install checks
Update development version to 2.5.10
Merge remote-tracking branch 'upstream/2.5.x' into 2.5.x