Fixed further postgres branch deviations
Fixed postgres datastore issues
Added couchdb_standalone.py for now
Added statement logging; implemented find_subjects/objects_mult
read_doc_mult and code polish
Improved statement logging
Postgres speed test prototype
Create doc now one statement; implemented _all_docs view
Set psycopg2 json to simplejson
Simplify sql statement building
Added call tracer utility
Use of tracer in container and postgres datastore
Enhanced tracer functionality