enable env CHPL_FAST_FLAG as alternative to --fast
Merge remote-tracking branch 'upstream/master' into env-for-fast-2
CHPL_FAST_FLAG -> CHPL_FAST
Added a check to Expr::verify()
Brief investigation into test/jacobi/waynew/example2 non-deterministic errors.

Adding the notes (though I intend to get to it for regressions week).
Merge pull request #635 from lydia-duncan/mysteriousJacobiInvestigation

Brief investigation into test/jacobi/waynew/example2 non-det errors.

Adding the notes (though I intend to get to it for regressions week).
Adding an note to the CONTRIBUTORS file for mis-attributed author commits

Due to the author mis-namings that stemmed from the conversion from
SVN/SourceForge to Git/GitHub, this commit flags those contributors
who were mis-named during the conversion process in order to set
the record straight where we give credit to past contributors.
Merge remote-tracking branch 'upstream/master' into env-for-fast-2
Merge pull request #636 from bradcray/contributors-misattributed

Adding an note to the CONTRIBUTORS file for mis-attributed authors

Due to the author mis-namings that stemmed from the conversion from
SVN/SourceForge to Git/GitHub, this commit flags those contributors
who were mis-named during the conversion process in order to set
the record straight where we give credit to past contributors.
Merge pull request #615 from vasslitvinov/add-a-verify-check

Added a check to Expr::verify()
that all AList elements point to each other via 'prev' and 'next' properly.
Merge pull request #458 from mppf/env-for-fast-2

Enable env CHPL_FAST as alternative to --fast

Such environment-variable triggering of --fast
is useful in some testing situations.