Update solver status handling.
Removed mint/ subdirectory.
Move solvers into a separate directory.
Update comments in MEX files and add first tests.
Add a simple script to recursively run checkcode and apply some
of the suggested changes.
Allow msubs to take a first argument of type double.
Improve recomp's handling of sizes.
Silence MOSEK output.
Make testCstr more informative.

Also, increase the tolerances for several PSD constraints in
testCstr/ to allow spot_mosek to pass randomized tests.
Removed some stale tests.
Fixed a long standing bug with mssprog.

Commit 47f7f9cfa542403294800da368ac2989a5ab77cc changed the
behavior of @msspoly/sparse.m.  This introduced a long standing
problem in mssprog2sedumi.m which this commit should fix.