to query from the ``rdb$relations`` view instead of the
``rdb$relation_fields`` and ``rdb$view_relations`` views.
Variants of both the old and new queries are mentioned on many
FAQ and blogs, however the new queries are taken straight from
the "Firebird FAQ" which appears to be the most official source
of info. [ticket:2898]

underscore.  Courtesy Treeve Jelbert. [ticket:2897]

index were not sorted correctly; they are now sorted
in order of RDB$FIELD_POSITION.

work with Firebird dialects; previously the decimal conversion was
not occurring.
- scale back some firebird FP numeric tests

This controls the value of the ``retaining`` flag sent to the
``commit()`` and ``rollback()`` methods of the DBAPI connection.
Defaults to False.  Also in 0.8.2, where it defaults to True.
[ticket:2763]

INT64 has been fixed so that LONG is treated as INTEGER,
INT64 treated as BIGINT, unless the type has a "precision"
in which case it's treated as NUMERIC.  Patch courtesy
Russell Stuart.
[ticket:2757]

- restore the rollback cleanup handler, pg8000 is mostly obsolete
as a dialect and the firebird drivers need it

- went through examples/ and cleaned out excess list() calls

- other cleanup
- don't need compat.decimal, that approach never panned out. hopefully
outside libs aren't pulling it in, they shouldn't be