Add .execenv files to set QT_NUM_SHEPHERDS=2 and update .lm-numa.good files

The number of communications depends on the number of shepherds when using the
numa locale model, so force the number of qthreads shepherds to 2.  Update
the .lm-numa.good files to match the comm counts for two shepherds.
Merge pull request #752 from daviditen/numaCommCountUpdates

Add .execenv files to set QT_NUM_SHEPHERDS=2 and update .lm-numa.good files
[reviewed by ronawho]

The number of communications depends on the number of shepherds when using the
numa locale model, so force the number of qthreads shepherds to 2. Update
the .lm-numa.good files to match the comm counts for two shepherds.
Updating REGRESSIONS based on past few days' runs
Minor cleanup to REGRESSIONS; update to REGRESSIONS-stories
Updating based on valgrind testing which just came in
Merge pull request #772 from bradcray/triage-sep-blc

Regressions update for the past few days

New regressions
---------------
* missing chpl_memcpy() prototypes (fixed now, still filtering through)

* got a recursive AMUDP_SPMDShutdown error in distributions/dm/hplx (vass)

* got a new suite of tests that get the "array index out of bounds error"
  (while the lulesh ones cleaned themselves up a few days ago) -- I think
  this is the qthreads memory fence issue that greg is looking into.

Improvements
------------
* extern/ferguson/c_ptrs now fixed for Mac (thanks Kyle!)

* overlapping memcpy valgrind issues now fixed (thanks hilde!)

* sungeun/lulesh timeouts resolved (thanks me!)

* leakedmemory5 no longer complaining about lack of suppression (thanks Lydia!)

* valgrind atomic tests silenced (thanks vass!)

* two lammps valgrind timeouts silenced (thanks vass!)

Misc
----
* moved qio_test consistent timeout to sporadic unless someone wants to
  take credit for closing it (I couldn't tell)

* noted new dates for sporadic timeouts
Add comment about testing nightly -debug against a clean repo.
Merge pull request #773 from thomasvandoren/nightly-debug-comment

Add comment about testing nightly -debug against a clean repo.