fixing concurrency bugs, adding feature to have different logins across threads
renaming files
fixing bug on iterations (not converted to int)
Merge pull request #709 from bcipolli/benchmark_concurrency

Benchmark concurrency - using different users
Merge remote-tracking branch 'leq/release-0.10' into db_1
benchmark: fixup script next step, enable verbosity, stagger thread starting
generaterealdata speed-up; use transaction handling