Make an explicit test for whether the prefix is in fact the
source directory, and then don't use the registry.

when it gets the path from the registry, it no longer appends the
default path to the end (which would mostly be a duplication).

The real change is that it now includes "Python.h".

- MS_DLL_ID is now set to "1.5" instead of "1.5.x" so Mark Hammond's
  extensions won't have to be changed.
- FILEVERSION and PRODUCTVERSION are set to 1,5,2,1.
  (The last number could be the build# or the alpha release# or so.)

could hide so long...

serial number isn't enough to uniquify the temp file name -- what if
two users are on the same machine?  Add in the (emacs-pid) to help
further.  Should never be tickled on Emacs 20, XEmacs 20, 21.

	buildindex.py appropriately.

add_idx(),
add_module_idx():  Add the appropriate parameters to the calls to
	insert_index().

implementation wins.

PyInterpreterState_New() and PyThreadState_New() -- but that you may
use it to serialize calls to them.

Added some dependencies to some of the HTML generation targets.

how to exit (in a platform dependent way!).  We use os.sep to
determine which platform we're on, since I expect that this will work
better for minority platforms.

with examples and workaround.  This keeps coming up, and I believe
that this section in the tutorial may have been (in part) the source
of the confusion.  While it didn't show examples with [] for a default,
it also didn't emphasize enough why that would be a bad idea, and
while it did say that defaults are evaluated at the point of function
definition, the example was not relevant for this issue.