Enhance ApplicationStatus based on presence of volumes

[JDiPierro]

• ApplicationStatus inherits from enum.IntEnum to allow more comparison of statuses
• Added function to get an application's volumes
• When checking application status use volume presence to indicate previously-started apps.
• My Applications View: Include previously started but not-running applcations.
• Application template: Include a case for never started applications.

[loomchild]

I am sorry for delay - I am terribly busy and going to FOSDEM conference this weekend, but will try to work on this next week.

[loomchild]

Ehh, still no time, will try to look into this once I clarify my personal affairs (probably in the last months of the year). Sorry for the long wait.