issue list: added 'Priority' column, removed 'Created on' column
post method verification for trackers/move
added the ability to set the sort order for trackers
added the ability to set the sort order for roles
removed png transparency (not supported in ie)
custom fields list screen split in 3 tabs (one for each kind of custom fields)
added the ability to set the sort order for issue statuses
updated css for online help
fixed french issue_edit mail template
removed environment information
