Return exit code 0 when stopping a non-running process

If any other error occurs in the stop script it will just raise an error as expected and not start sickbeard.
Add Vacuum action to history trim/clear functions to reclaim space.
Minor typo fix on ConfigPostProcessing
Merge pull request #870 from thezoggy/dev--history_vacuum

vacuum on history clear/trim
Merge pull request #868 from jeroenj/patch-1

Return exit code 0 when stopping a non-running process in ubuntu init script
Episode Status Management tweaks
* Add 'expand all shows' button
* Add 'toggle all' button
* Add **Unknown** status to be queried (useful to find episodes that belong to a show with invalid location)
* Add options to filter out inital data set
  * Include specials (season0) - before we always excluded
  * Exclude episodes without airdate 'never' - before we always included