[development] Extend database abstraction layer, to include table creation.

[Chris Johnson]

Adrian Rossouw wrote:

> we specify integer, longtext, shortext blah .. and the abstraction layer
> changes that into whatever the equivalent is for that database type.
> 
> ie: varchar() and text in mysql / postgres.
> 
> Choose _SENSIBLE_ types, _FOR US_ and then change it into whatever
> works for each database.

Exactly!

(makes note to self:  engage brain before typing next time)

..chrisxj