Fixes and additional tests for readless increment handling on flush and compaction
Refactor and simplify internal processing of increments
Apply readless increment fixes to HBase 0.94 and 0.96
Use Tephra 0.3.4 release
Add some comments to increment logic and don't try to sum deletes
Add tests for mixed increments and deletes
Add test for increment handling of delete markers on raw scans
Merge pull request #860 from caskdata/feature/readless-incr-fix

CDAP-1062 Readless increments can drop cells on flush and compaction