DRILL-731: Speedup TestConvertFunctions test case
DRILL-749: Zero-fill the Offset Vectors buffer contents
Disabling intermittently failing JsonRecordReader2Test.
DRILL-733: Reduce memory footprint of unit tests
DRILL-750: Use a singleton PooledByteBufAllocatorL instance for all TopLevelAllocator instances
DRILL-707 : Replace ValueAllocator with allocateNewSafe() in SVR. WIP.

remove valueallocator in SVR.

SV for Limit OP.

Selection vector remover. More WIP.

code clean up.

reverse rule change.
DRILL-728: Show SelectionVectorRemover and single mode changes in text plan output.
Zero out RepeatedMap and RepeatedList offset vectors.  Advance var* lastSet when using copy safe.
DRILL-712: Right side of Left join has zero values when should be null
Fix bug in SVR, handling the remaining copy.
Additional comments regarding DRILL-728
Disable failing test
Disabling HBaseTestsSuite, will enable after ValueVector fix.

+ Reduced the memory requirements of the test.
DRILL-705: Adding window functioning

Currently only supports partitioning/ordering, not yet preceding or after offsets