Various little fixes to Firebird reflection

[Former user]

FB reflection has a little bug: it uses sqltypes.Double() instead of .Float() to represent double precision fields; the former does not even exist.

Also, it doesn't load the primary key fields.

The attached patch cures this problems. If this sounds good, I will try to complete the fix with another patch for the foreign keys.

[Lele Gaifax]

Patch that fixes a glitch and initialize primary_key

[Former user]

Augmented version, that implements also FKs

[Mike Bayer]

this is committed in changeset:1789. i have no resources to test firebird so hopefully this one works already.

[Former user]

Can the reflection be two queries instead of three by removing the primary key query and selecting in the foreign keys query the primary keys too.

WHERE RC.RDB$CONSTRAINT_TYPE IN ('PRIMARY KEY', 'FOREIGN KEY')

[Mike Bayer]

Milestone next micropoint release deleted

[Mike Bayer]

Removing milestone: 0.4.0 (automated comment)