Redoing commit that linked aggregateoccurrence forward to individualplant, allowing many taxonoccurrences (e.g. one for each specimen) to point to the same plant (e.g. that those specimens came from)

Added NYBG input

input.Makefile: Run tests with verbose output

bin/map: Fixed bug where verbose/debug flags were ignored and message were always printed.

bin/map: Added verbose and debug options. Added initial debug info.

xml_dom.py: Added is_simple() to determine whether every child recursively has no more than one child. Used is_simple() to print condensed XML when simple nodes are converted to a string.

vegbien.sql: Enforce 1:1 relationship between aggregateoccurrence<->individualplant and taxonoccurrence<->specimen

vegbien.sql: Changed individualplant UNIQUE constraint to enforce 1:1 relationship between aggregateoccurrence and individualplant

Undoing previous commit since it would prevent a plant from being tied to a data source, because the aggregateoccurrence pointer goes in the wrong direction

vegbien.sql: Added aggregateoccurrence.individualplant_id to make a 1:1 relationship between aggregateoccurrence and individualplant