Add small TODO entry idea now that $GNUPLOT path can be changed in config file.
Add small TODO entry idea now that $GNUPLOT path can be changed in config file.

gregs1104/pgbench-tools,teoincontatto/pgbench-tools,teoincontatto/pgbench-tools,gregs1104/pgbench-tools,teoincontatto/pgbench-tools,gregs1104/pgbench-tools