Detect already released bugs when marking a task as readonly

When a task is marked as 'ReadOnly', search for other packages in other tasks
with the same version, and mark them as 'Already Released'.

Also, remove all bugs and nvrs from other tasks that have packages marked as
'Already Released'.
Merge branch 'master' into already_released
Fix some minor bugs for 'Already Released' feature
Merge pull request #153 from thescouser89/already_released

Already released