[Users] Checkpoint/recovery inconsistencies

[Erik Schnetter]

After a bit of clean-up, this is the final patch I intend to commit.
In addition to what was discussed earlier, this also introduces a new
MoL schedule group MoL_PostStepModify:

Phyics thorns can apply enforce constraints in PostStepModify. The
difference between PostStep and PostStepModify is that PostStep is
scheduled at many other occasions, whereas the PostStepModify is only
scheduled during evolution.

Please comment.

-erik

-- 
Erik Schnetter <schnetter at cct.lsu.edu>   http://www.cct.lsu.edu/~eschnett/
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