code cleanup for release 4.1

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Chad, as part of the code cleanup for release 4.1, I'd like
to contribute some function name changes and subtle code
re-organization in preparation for the gnats-dbi integration
(which I think we're going to fold into Gnats 5.0).

The name changes support the internal dbi api which I've put
together to define the interface between the higher level
GNATS functionality and the datastore specific stuff.

IMO, these name changes also make the code a little easier
to read and understand.

I just got back from a fairly long vacation, so, I'm going
to start putting the patches together and contributing them
to the help list for review. If everyone is happy with the
changes, I'd like to begin committing them into the 4.1 release.

Note: there will be no functional differences introduced.
This is purely a cleanup effort which will preserve the
existing threads of execution.

Let me know if you find this acceptable (or not). I think
that providing these patches in small chunks will make the
whole dbi project a lot easier to swallow and digest.

- -Mel
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