fixed ENG-6407
use spaces, not tabs
ENG-6401 Added MIN to the matviewbenchmark
ENG-6401 Removed code for testing
progressively flushing error info in order to reduce memory consumption. blocking row insertion when failed queue is filled by too many requests.
Add dedicated thread for writing errors into disk.
ENG-6419 Fixed tree structure checks so it passes on java 8
ENG-6401 Moved class var reset location for clarity
Merge pull request #1418 from VoltDB/ENG-6401

ENG-6401 Added MIN to the matviewbenchmark
made same change to JDBCBenchmark.java
untabify
change few static variables to non-static. make sure all error info are written to file properly.
Merge pull request #1404 from VoltDB/ENG-6407

Eng 6407 - corrects final stats total count in voter so that the total calls = accepted + rejected + errors.  Previously the counts were slightly off due to the stats reset immediately after the warmup period when some queued requests could still be counted.
remove unnecessary trailing whitespaces.
Merge pull request #1423 from viirya/fix_csvloader

ENG-6490: Fixing out of memory errors during CSV data import
Merge pull request #1425 from VoltDB/ENG-6361

Eng-6361: pass two extra parameters from engine to frontend
ENG-6490: Make error info queue limit settable in the CSVLoader.
Merge pull request #1427 from VoltDB/ENG-6419

ENG-6419 Fixed tree structure checks so it passes on java 8
ENG-6466 Added weighted percentage pie chart to web studio
txnid2: do a slightly better job with the special case of mpratio=0.0 in all threads wrt suppressing mp write queries