support for EB checkpoint files

[drangara]

No description provided.

[WeiqunZhang]

BuildFromChktFile takes optional arguments int ngrow=4 and bool extend_domain_face. I wonder if these two should be saved in checkpoint files and read from files instead. What would happen if the values passed to BuildFromChkFile don't match what were used originally?

[drangara]

That's right. I don't think it will work if ngrow on the finest level or extend_domain_face are different between the write and the read. I've now added the following settings when writing the checkpoint file - 1) problem hi & lo, 2) ngrow, 3) extend_domain_face, and 4) max_grid_size in ChkptFile::writeHeader. I've added asserts to make sure these settings are the same when reading from the checkpoint file in ChkptFile::read_from_chkpt_file. Hopefully that ensures we don't break implicitly.