Accounts Database Creation Script

Added a script which initializes the accounts database. The new
database (which depends upon sqlite3) has five columns:
	id		INTEGER PRIMARY KEY AUTOINCREMENT
	name	VARCHAR
	hash	VARCHAR
	pretty	VARCHAR
	created	TIMESTAMP DEFAULT CURRENT_TIMESTAMP

This will be the basis for the accounts system. Any other features
needed by modules which interface with the accounts should be provided
by those modules.