Simplify power test script

First fix the start transaction marker for postgres query generation.
Then we don't need separate query parsing and flattening.  Also use date
to calculate elapsed time instead of the custom gtime script.  This also
reduces the number of external scripts that are used to for query
explaining and execution.
Simplify throughput test scripts

Reduce the number of external dependencies.
Stop using gtime
Remove gtime

Use `date +%s` instead.
Remove parse_query

Not really needed...
Removed examples directory

No currently relevant examples.
Remove power program

Doesn't seem like it's been used in a while.
Posix compliant function declarations

Remove more bash-isms.
Convert time stat recording to shell function

Reduce the number of external scripts used and called.
Fixed queries for materialized views
Reduce error messages that go to terminal