DataStore2/QuickSearch: CLEANUP POST PARAMS

DataStore2:

 The 'create_columns' POST param that was sent with create operations has
 been disabled. This was added a long time ago as some kind of ugly hack
 (which I can't remember/find any docs about) and doesn't appear to be
 needed. So, now its being removed and we'll see if anything breaks...

QuickSearch:

 The generic param names 'fields' and 'query' have been renamed to
 'qs_fields' and 'qs_query'. Additionally, quick search params are now
 only set when a query is actually present.

These changes make CRUD requests a lot less noisy...

(set dev version 0.99501_14)