Remove the now defunct boxcar notifier.
Added support for the new append method from NZBGet 13+

Based on PR-851 by Prinz23
Merge branch 'PR-852_remove_boxcar_notifier' into development

* PR-852_remove_boxcar_notifier:  closes gh-852
  Remove the now defunct boxcar notifier.
Merge branch 'PR-851_add_nzbget13_support' into development

* PR-851_add_nzbget13_support:
  Added support for the new append method from NZBGet 13+
  based on PR-851 by Prinz23
Change download stats 'back'

Don't show download and snatched as split values on home progress bar
Include never aired but downloaded in counts

Count aired never downloaded/ snatched stats
Change initial search run delay times to lower values
Merge branch 'change_download_stats' into development

* change_download_stats:
  Change download stats 'back'
Merge branch 'change_initial_search_run_delay_time' into development

* change_initial_search_run_delay_time:
  Change initial search run delay times to lower values
Merge branch 'development'

* development:

Change initial search run delay times to lower values

Change download stats 'back'

Added support for the new append method from NZBGet 13+. Pull #851

Removed notifier Boxcar. Pull #852