DRILL-1414: Move profile storage to DFS rather than using PStore
DRILL-98: MongoDB storage plugin

This commit disables MongoDB PStore due to changes to the PStore interface.
DRILL-1425: Handle unknown operators in web ui
DRILL-1426: Add IO wait stats to HBaseRecordReader
DRILL-1398: Clone HivePartition only when InputSplit has non-null partition in InputSplit->Partition map.
DRILL-1407: Add scan size calculator option to HBase storage plugin configuration
Temporarily disable fragment limit. Log warning instead.
DRILL-1371: HBase queries fail when hbase.scan.sizecalculator.enabled is set to false
DRILL-1465: Enhance push partition filter rule to handle Filters appearing above a Project. Modify group scans' digests to include number of files being considered.