Updated DB structure for product changelog tables
Deprecating table vendorLoadScripts
Cleaning up database cruft. Got rid of:
* fannie.op.AdDates
* fannie.op.batchMergeLC
* fannie.op.batchMergeProd
* fannie.op.CashPerformDay_cache
References to these tables are mostly gone from the code base.
Cashier performance data will be cached in either
CashPerformDay or CashPerformDay_cache depending which is actually
a table. Ditto for the report that uses that data.

SQLManager has a new isView() method and I tweaked the adodb library
to correctly detect mysql views.