#22 Core modules altered to work with Postgres

[rebeca]

Data types in the install.sql files changed to be
PG-friendly.

Uses of "regexp" changed to "~".

All table column names and variable names to
lower-case. I'm sure there's an elegant solution to
using mixed-case column names with Postgres, but
since I haven't found it yet, I just changed them all
to lower-case.

[rebeca]

A diff on an artificial directory (coremodules) comparing my installation and 0.9.3-2

[Shaun Murray]

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Thankyou for your patch. We've taken the decision to not support Postgres prior to
v1.0 and are therefore closing this patch request.

If your patch is still valid in v1.0, please revisit your code and resubmit.