pg_get_domaindef

Hi,

Attached is a small patch that implements the pg_get_domaindef(oid) function.

Somethings I am not sure about the patch and which I can fix based on your
input are as follows.

- I have used SPI interface.  I saw that in ruleutils some methods make use
of SPI interface whereas others use internal APIs. I wasn't sure about the
reasons. If this is wrong, I can attempt a rewrite using internal APIs.

- This function does not output the constraint name. I couldn't find the
constraint name given by the user as part of the create domain command being
stored in any system catalogs. The entry in pg_constraints store a system
assigned name. But this may be because of my limited knowledge of the
internals.

- documentation. If this patch is good then I can do this later.

There may be other issues, which I will be happy to fix.

Rgds,
Arul Shaji
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