input.Makefile: Mapping: Use the staging tables instead of any flat files if use_staged is specified

bin/map: Support custom schema name. Support input table/schema override via env vars, in case the map spreadsheet was written for a different input format.

sql.py: qual_name(): Fixed bugs where esc_name() nested func couldn't have same name as outer func, and esc_name() needed to be invoked without the module name because it's in the same module. select(): Support already-escaped table names.

main Makefile: $(psqlAsAdmin): Tell sudo to preserve env vars so PGOPTIONS is passed to psql

root map: Fill in defaults for inputs from VegBIEN, as well as outputs to it

disown_all: Updated to use main function, local vars, $self, etc. like other bash scripts run using "."

vegbien_dest: Fixed bug where it would give a usage error if run from a makefile rule, because the BASH_LINENO would be 0, by also checking if ${BASH_ARGV⁰} is ${BASH_SOURCE⁰}

postgres_vegbien: Fixed bug where interpreter did not match vegbien_dest's new required interpreter of /bin/bash

vegbien_dest: Changed interpreter to /bin/bash. Removed comment that it requires var bien_password.

postgres_vegbien: Removed no longer needed retrieval of bien_password