ENG-4119.  Fix invocations vs. timedInvocations bug. It was just a mixup in the
order of args.
ENG-4119. Added TIMESTAMP column to PROCEDUREPROFILE results.
Got rid of timedInvocation entirely.  All averages and weighting will be
done on invocations.
Merge pull request #564 from VoltDB/ENG-4119-ruth-fixup

Eng 4119: replace timedInvocations with Invocations. Add TIMESTAMP.