schemas/Makefile, py_functions.sql.make: Generate py_functions.sql from vegbien's py_functions schema

main Makefile: postgres-Linux: Install postgresql-plpython

main Makefile: python-Linux, postgres-Linux: Fixed bug where apt-get installs needed to each be run in a separate command, so that if any package was not found, the other packages would still install. (apt-get aborts on the first invalid package name.)

db_dump_localize: Use new pg_version

Added pg_version

sql.py: into_table_name(): If relational function has a value argument, don't include other arguments, to save space

sql.py: add_pkey(): Version the index name just in case add_suffix() doesn't correctly preserve a needed version #

sql_gen.py: add_suffix(): Fixed bug where only strings already at the max length had the version preserved, even though appending the suffix could bring it past the max length and still cause the version to be overwritten. Fixed bug where last # in str, not first, should be considered to precede the version.

sql.py: put_table(): mapping param: Fixed documentation of supported key/value types

db_xml.py: put_table(): Removed no longer accurate comment about handling _simplifyPath