Please unblock python-gmpy 1.12-1

[Martin Kelly <aomighty@gmail.com>]

Hello,

I am the current maintainer of python-gmpy and would like python-gmpy 
1.12-1 unblocked from the Squeeze freeze. It is already in unstable and 
has no outstanding bugs.

This version adds support for Python 3 (which is needed for Squeeze) as 
well as Python 2.7 and some bug fixes. There are no significant changes 
in the packaging (it has a standards-version bump with no changes as 
well as a move from pycentral to dh_python2).

Thanks,
Martin Kelly