[Dbix-class] multi column select distinct patch

[luke saunders]

As discussed on #dbix-class attached is a patch which contains the
following:

- horrific but temporary hack to allow SQLite and Oracle to do counts on
resultsets with multiple column select distincts
- tests to check this
- a change to the cookbook to add some clarity to the select -> { count => {
distinct => [...] } } stuff

Notes:
- I've made a class called Retarded.pm <http://retarded.pm/> which should
probably be renamed to something less offensive
- the hack should be replaced with something sane once there is subselect
support

Cheers,
Luke / captainL
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