Allow commits to reference issues of parent projects and subprojects (#4674).
Log email delivery errors.
Log info when sending an email notification.
Fixed: deleting a project with subprojects breaks the project tree (#4701).
Translation updates * pt-BR (#4692) * sv (#4666) * zh-TW (#4654)
Merged r3351 from trunk.
Fixed: potential security leak on my page calendar (#4691).
tagged version 0.9.1
Merged r3348 from trunk (version set to 0.9.1).
Updates for 0.9.1 release.
