[development] Schema API patch ready for review

[Barry Jaspan]

This patch implements and uses Schema API 1. It comes from
http://drupal.org/node/136171 and is the combined effort of myself,
frando, yched, nedjo, and others.

The Schema API replaces calls to CREATE TABLE and related statements
with a schema data structure and API functions.

http://drupal.org/node/144765

Thanks,

Barry