implement permission system for ticket. Added    - None   - trac permission model, see #202, #203
implement permission system for ticket. Added 
  - None
  - trac permission model, see #202, #203


git-svn-id: e959ebe540f258281fb77864025b49ae95417172@397 51ba4ec3-dd23-0410-a888-bc9a71dd14c1

dscho/email2trac,dscho/email2trac,dscho/email2trac,dscho/email2trac