Implemented basic support for permissions.
Implemented permission check for timesheet and expense extension.
Code cleanup.
Fixed installation of permissions for expense extension.
Errors when adding users are shown correctly.
Improved logged permissions error messages.
Fixed updater to set admin group membership correctly.
Added missing function to get groups of an activity.
Fixed several bugs.
Membership of users in groups can be set with a membership role.
Fixed wrong output of over budget value. (fixes #77)
Merge branch 'master' of github.com:kimai/kimai
Added Dutch translation file.
Merge branch 'permissions'
Updated nl-BE to have shorter text for retype password.
Global role for users can be set in their edit floater.
Replaced user status (admin, groupleader, user) with global and membership role permissions.
New user will have same global role as current user.
Improved error reporting of global_role_allows function.
Fixed missing user ID when non-admins add new timesheet entries.
Fixed reload of roles list in admin panel.
Fixed editing membership roles.