Reset App in MultiApp

[friedmud]

I need to be able to "Reset" an app. What I mean by reset is that I need to delete the current instance of the App and rebuild it. The start time for the "new" app should be set to the global simulation time.

The tricky part is going to be output. When I reset an App I need to start writing a new output file. It should probably use the Adaptivity way of naming the new output. I don't know everything about this yet....

[friedmud]

In 37a0cc6:

Can reset an App at a specific time closes #1970

[friedmud]

In 4bda56a:

change how output files are named after a reset ref #1970

[friedmud]

Reopening because time isn't working out properly. I had originally thought to make the time of the reset App match that of the rest of the problem, but that's problematic because things in that App might depend on time (for instance, ramping up forcing functions).

Instead of doing that, I'm going to let each App run on "local" time... but output will still happen in "Global" time.

[friedmud]

In 5c51f6f:

let apps run on local time but still output at global time closes #1970

[friedmud]

In c2f08b7:

fix app reset ref #1970