Update scripts for postgres 9.3 only

Postgres 9.2 with the json_enhancements will technically work, but just
keeping the scripts  simple.  This is not to say work to provide
compatibility with postgres 9.2 will be rejected.
Move vm dir to yamsvm

This is just so that the vm is more easily identified in the
VirtualBox GUI.  Also update the PGDG apt-get config to use precise
packages, and made the etl Makefiles use pg_config to determine build
directories.