bin/map: in_is_db: Don't cache the main SELECT query

bin/map: by_col: Use the created template, which already has the column names in it, instead of mapping a sample row

bin/map: Fixed bug where db_xml could not be imported twice, or it was treated as an undefined variable for some reason

bin/map: map_table(): Make each column a db_xml.ColRef instead of a bare index, so that it will appear as the column name when converted to a string. This will provide better debugging info in the template tree and also avoid needing to create a separate sample row in by_col.

db_xml.py: Added ColRef

bin/map: Fixed bug where row count was off by one if all rows in the input were exhausted, because the row that raises StopIteration was counting as a row

main Makefile: VegBIEN DB: mk_db: Use template1 because it has PROCEDURAL LANGUAGE plpgsql already installed and we aren't using an encoding other than UTF8

Moved "CREATE PROCEDURAL LANGUAGE plpgsql" to main Makefile so that it would only run when the DB is created, not when the public schema is reinstalled. This is only relevant on PostgreSQL < 9.x, where the plpgsql language is not part of template0.

Renamed parallel.py to parallelproc.py to avoid conflict with new system parallel module on vegbiendev

Makefile: VegBIEN DB: public schema: Added schemas/rotate