[GSOC]Firebird Integration Weekly Update 06

Hi everyone,

A brief summary of this weeks progress:

-Firebird building on mac (just some library paths needed fixing for
LO's ICU to be usable).
-Merged into master*, placated the tinderboxes.
-Cleaned up the registry/installation details.
-Removed some unnecessarily duplicated code left over from skeleton
driver.
-Reworked FStatement to use transactions from FConnection.
-Reworked the ResultSet twice**.
-Implemented most of ResultSetMetaData (mostly reading docs).
-Reworked the driver to use one mutex per connection, which turns out to
be unnecessary since fbembed is thread safe as of firebird 2.5, i.e.
I'll probably have to revert this change (it won't revert cleanly
in git unfortunately, but shouldn't be too complex either).

The driver can once again actually read out the list of tables stored in
the database (various things broke at various points when I was
reworking the ResultSet to use different data storage).

I'm now also starting to work on making the driver appear actually
functional from a users perspective i.e. showing columns in a table,
etc. (Mostly DatabaseMetData + possibly some work on ResultSet for more
Datatypes.)

*Currently no firebird when cross-compiling -- debian on arm however has
natively compiled firebird which would hopefully be usable for raspbian
etc. possibly using --with-system-firebird.

**Once to use internal storage with ORowSetValue (for some reason I
thought I had to emulate a scrollable cursor, which turns out to be
unnecessary), and again to not use internal storage at all i.e. retrieve
data directly from firebird when needed. (Not all storage types are
currently implemented, I'll keep adding these.)

Cheers,

        Andrzej