In data2xml, fixed xpath.get() to do last_only optimization properly for pointer targets

In data2xml, added support for XPath pointers

Merged data2xml XPath functionality into xpath.py. Merged data2xml xml_dom.py and xml2db xml_util.py into identical xml_util.py for each script.

Added empty_db script to reset the vegbank database after running xml2db/test in commit mode

Changed xml2db and vegbank db to be owned by new user vegbank

Changed xml2db and data2xml to help standardize mapping to different XML formats

Added DROP DATABASE and CREATE DATABASE to vegbank.sql

Changed xml2db to use primarily node contents to determine whether a node is a field or a child table

Changed xml2db to use the first column in a table as its primary key

Changed xml2db to avoid inserting duplicate rows

Initial version of xml2db. Doesn't yet handle all duplicate rows correctly.

Removed .pyc files

Added BIEN 3 scripts

Added ability to change the vegx node names to be different from the postgres table names.
This was the easiest way to change the postgres table names when the vegx names are
not useable for some reason. This requires that the node names be altered in the xsd...

Adding scripts to transfer data between BIEN2 to VegX schema.
Bug fixes to models.py

Some bug fixes.
Slight hack in eml-coverage and veg.xsd to get around Django case-insensitivity & VegX entities that only differ by case.
Changed default db relationship to one2many from many2many

Committing first working copy of models.py. Other py/pyc files are added/modified just to get in repos.

Adding vegx definition. Current models.py building script.

Initial import of Django version of BIEN

Removing needless files.

Inital import for script that converts vegx files into django objects.

No longer need concept hash since values are now pulled directly from tapir service

First Import