Initial commit of the HPD database
Add predefined atomic datatypes
Have UUID for every node
Replace ROLE table with ENUMs
Make changes required to set up the database
Rename create.pgsql to create.sql
Replace tabs with spaces in database/create.sql
Add NASA EOSDIS URS info to authentication domains
Use full HDF5 datatype class names
Separate db creation from content statements
Use email as user identifier
Add name to USER table
Add user, project content for testing
Use proper HDF5 layout terms for ENUMs
Enhance VERSION table

* created column now defaults to current_timestamp
* Entity, label, and root node must be unique
Default value of node.rank column is 0
Strengthen the NODE table declaration

Declare (parent, child) as primary key and constrain them as not null.
Remove all datatype-related tables from the database
Add a project for various test files called: Various
Program for importing test files into database