Applied verbatim; patch to PC/winreg.c applied to PC/_winreg.c due to name change.

just testing the SF patch manager

Tim, please review!  Then assign to Trent if it's OK to commit.

Changed to Accepted, assigned back to Trent for commit.

Looks good, Trent!  My only gripe is about the hash function for complex numbers (because it's symmetric), but that problem existed before and you haven't made it any worse.  Ship it (I'll improve the complex hash later).

Changed to Accepted, assigned back to Trent for commit.

Looks good, Trent!  My only gripe is about the hash function for complex numbers (because it's symmetric), but that problem existed before and you haven't made it any worse.  Ship it (I'll improve the complex hash later).

This patch addresses two main issues:
(1) There exist some non-fatal errors in some of the hash algorithms. For
    exmaple, in float_hash and complex_hash a certain part of the value is
	not included in the hash calculation. See Tim's, Guido's, and my
	discussion of this on python-dev in May under the title
	          "fix float_hash and complex_hash for 64-bit *nix"
			  
(2) The hash algorithms that use pointers (e.g. func_hash, code_hash) are
    universally not correct on Win64 (they assume that sizeof(long) ==
	sizeof(void*))

As well, this patch significantly cleans up the hash code. It adds the two
function _Py_HashDouble and _PyHash_VoidPtr that the various hashing routine
are changed to use.

These help maintain the hash function invariant:
	(a==b) => (hash(a)==hash(b)))
I have added Lib/test/test_hash.py and Lib/test/output/test_hash to test this
for some cases.

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