Prep for ENG-5135, improve some tests, rework VoltDB patches to hsql NumberType.
restore a test table used in pro testing
ENG-3135-prep improve sqlcoverage UPDATE testing, remove outdated "regression" scripts.
Update regression-config.py

move comment.
Merge pull request #781 from VoltDB/master

back-merge master to branch (prep for final merge)
Merge branch 'master' into ENG-5135-prep

Conflicts:
	tests/frontend/org/voltdb/regressionsuites/RegressionSuite.java
	tests/frontend/org/voltdb/regressionsuites/TestPlansGroupByComplexMaterializedViewSuite.java
Merge remote-tracking branch 'origin/ENG-5135-prep' into ENG-5135-prep
Merge pull request #799 from VoltDB/release-3.7

Back merge from Release 3.7
Merge pull request #804 from VoltDB/ENG-5135-prep

Close ENG 5044 and prep for 5135 work -- r=xjia, except for some later test tweaks