* basic histogram thread using non-arangod threading ... soon to change.
* Add --latency flag. start histogram thread if set.
* convert quick_hist to use arangodb thread and condition objects
* move histogram object to be within ImportStatistics structure.
* update the thread shutdown to 1. work and 2. post last data
* add text that values are in microseconds to command line help.
* CHANGELOG note for new import latency option
* quick_hist.h rename to QuickHistogram.h
* update include file name to QuickHistogram.h
* update variable names to match coding standard
* a couple more code standard changes. try/catch around push_back
* initial check-in of working auto block size tuning for import. Needs clean-up.
* partial fix in this branch to enable testing, awaiting better fix in different branch.
* move pacing code from findIdleSender to AutoTuneThread object.
* move pacing code from findIdleSender to AutoTuneThread object. clean up dead code. add comments about algorithm.
* edits to algorithm discussion
* correct logging level. add CHANGELOG entry.
* update comment concerning proper usage of shutdown()
* initialize new static member MaxBatchSize. Correct sendCsvBuffer() call to addPeriodByteCount() since _outputBuffer drained by sendData().
* remove redundant semicolons. add new static member MaxBatchSize.
* move MaxBatchSize to ImportHelper so both ImportFeature object and AutoTuneThread object can access it.
* minor updates to comments and statics
* add pacing discussion to import manual page
* minor edit
The `--translate` option can be specified multiple times (once per translation
to be executed). The following example renames the "id" column from the input
file to "_key", and the "from" column to "_from", and the "to" column to "_to":
arangoimp --type csv --file data.csv --translate "id=_key" --translate "from=_from" --translate "to=_to"
`--translate` works for CSV and TSV inputs only.