Checkpoint and restart

[rjleveque]

checkpoint and restart capabilities should eventually be added.

[gradylemoine]

Could you elaborate on this? I think they're halfway in for the 2D and 3D code.

[rjleveque]

Yes, I think there's a capability to restart from a fort.q file, which seemed like a reasonable thing to do for a single-grid run at least as long as the full solution is printed out to full accuracy (which I think it is by the default outN.f routines). This is probably sufficient, we should just make sure it still works and also add for 1d.

amrclaw now has various options for specifying how often to dump all the information about grids needed to do a restart, see checkpt_style at the bottom of
http://clawpack.github.io/doc/setrun.html
For consistency we could introduce the same parameter choices in classic, but maybe not worth it unless there might be more that needs to be saved than what is currently going into fort.q files.

I could move the discussion of the checkpt_style parameter to the description of amrclaw parameters rather than the general setrun documentation.

[mandli]

All the checkpoint parameters are being included in the classic data structures so are identical to the AMRClaw/GeoClaw checkpoint parameters.