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Here's a new patch that addresses several remarks:
 o _decimal now has __floor__ and __ceil__methods.
 o libmpdec is now in a separate directory.
 o I removed the big libmpdec test suite. This is why:
 - It reduces the number of files that has been criticized multiple times.
 - Probably I'll be the only one who will be running the test suite.
 - The test suite is still on PyPI.
 - The test suite is so large that it's a magnet for toolchain bugs.
 For example, it found a bug in suncc (acknowledged and fixed by Sun)
 and a bug in CompCert (acknowledged and fixed by Xavier Leroy).
 I'm really worried that *if* someone runs the tests and finds
 an obscure bug, I'll have to spend hours debugging something
 that might ultimately be an external bug.
 o Renamed "python" directory into "tests".
 o Test functions in mpdecimal.c are removed.
 o All files in libmpdec that aren't required for _decimal are removed.
 o Extra functionality in _decimal.c is commented out. This does not
 yet cover the FloatOperation signal, which I would like to add
 to decimal.py as well (I'll ask later on python-dev).