Initial commit of the qb_data module:

This module imports and tracks entity information from Quickbooks.  For example,
it can facilitate the import/export of all customers, all products, etc.

The QB information this module stores for each entity record is limited to
Quickbooks' ListID ( internal identifier ), Name, and Active status.  It also
stores internal records required to update or sync values.

The intended use of this module is to store skeletal values sufficient for
listing records and tracking their updates; and use other modules ( e.g. a CCK
field module, forthcoming) to manage other values and business rules.

It's a work-in-progress, of course.