Fix automake warning
Add .gitignore
Update dbgen to 2.7.0 release

Also updated the autoconf and automake scripts appropriately
Fix dbgen format warnings
Add postgres specific macro for data generation
Fix handling of postgres db parameters

The case when no parameters are to set was handled incorrectly.
Ignore .psqlrc

Custom setting may cause unexpected behavior.  Also fix the SQL
statements in the postgres refresh stream scripts.
Update query results plotting to use R

And to use an more digestible csv format.
Update postgres scripts to wait
Update general and pgsql stats collection

This removes the requirement on having gnuplot, but still relies on
having R.  Use sar and sadc to generate csv data to replace vmstat and
iostat data collection.  Also collect pidstat data.

Update postgres database stat collection to generate csv files.
Plot script to handle multiple throughput streams
qgen flag for postgresl EXPLAIN ANALYZE

Re apply hack to run tests using EXPLAIN ANALYZE instead of returning
query output.
Update extension of output files

Use .txt where appropriate.