ENG-4284: add conversion between TIMESTAMP and VARCHAR using standard library, supported format: YYYY-MM-DD HH:MM:SS.XXXXXX.
Merge branch 'master' into ENG-4284
ENG-4284 casts between timestamp and varchar
ENG-4284 tweak to avoid false alarms from gcc
Merge branch 'master' into ENG-4284
ENG-4284 fix negative function test
Merge branch 'master' into ENG-4284
ENG-4284 rework casts to get around range limitations and share code with existing datefunctions.
Merge branch 'master' into ENG-4284
licenscecheck whitespace
Merge branch 'master' into ENG-4284

Conflicts:
	tests/frontend/org/voltdb/regressionsuites/TestFunctionsSuite.java
Merge pull request #908 from VoltDB/ENG-4284

Eng 4284