OpenACS

 per-category custom fields to the wrong table. Moved it to ca_attributes

 and changed pl/pgsql and tcl api's accordingly.

- Create index in ca_attributes to improve speed. Still need to assess

 where else we need indices.

- Changed API a bit. A couple functions named _exists_p were not boolean

 at all, hence confusing.

- Updated user/admin files to reflect changes.

- Adding of custom fields now lets site-wide admin add site-wide custom

 fields, otherwise only package-wise custom-fields.

- Improved fields UI. Needs more work.

- Updated Tcl callbacks.

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