switch GMSchema to Postgres
remove GMSchemaOracle
update table_names to match Postgres schema
all classes now use UUID generators
IDs are now 32 character text (UUID)
update channel_for_model to work with UUIDs
fix expected output wrt oracle date vs pg date format
columns are case sensitive
update Meta DB for Postgres
add OldGMSchema
Make Model/Command/Import/Metadata.t test pass

This replays part of commit 89ebc0cbd7398ca5e8c31445e46ea6a8afc336de
which was undone by commit 65e970fb2b36deef08d1773fafec1b419dd892eb
fix expected output wrt oracle date vs pg date format
Data source pointed to the old Oracle schema

The graphite metrics collector will use this to look up session info.
We'd like to see the session count drop to 0
remove use of GENOME_QUERY_POSTGRES
remove GENOME_QUERY_POSTGRES
remove Genome::DataSource::PGTest
remove use of Genome::DataSource::Main
remove Genome::DataSource::Main
Merge Postgres transition branch