DRILL-693: Include system and session options in fragment options
DRILL-694: Implement parquet writer.

Enable "CREATE TABLE AS" with parquet as the output format.

Add decimal metadata support to parquet reader and writer.
DRILL-558: Remove workaround in OptiqScanner for skipping "metadata" subschema.
Remove the *.orig files lying in the repo.
DRILL-623: Unable to run query containing quoted schema name