function.

* Add a better test for deepcopying.

* Add tests to show the __init__() function works like it does for list
  and tuple.  Add related test.

* Have shallow copies of frozensets return self.  Add related test.

* Have frozenset(f) return f if f is already a frozenset. Add related test.

* Beefed-up some existing tests.

  by the function object or by the method object, the function
  object's attribute usually wins.  Christian Tismer pointed out that
  that this is really a mistake, because this only happens for special
  methods (like __reduce__) where the method object's version is
  really more appropriate than the function's attribute.  So from now
  on, all method attributes will have precedence over function
  attributes with the same name.

Brings the functionality back in line with sets.py.

dangers of trying to iterate over weak dicts.

(Requested by Alex Martelli.)

* Improve the hash function to increase the chance that distinct sets will
  have distinct xor'd hash totals.

* Use PyDict_Merge where possible (it is faster than an equivalent iter/set
  pair).

* Don't rebuild dictionaries where the input already has one.

Also SF patch 843455.

This is a critical bugfix.
I'll backport to 2.3 maint, but not beyond that.  The bugs this fixes
have been there since weakrefs were introduced.

from the OS9 readme that is still relevant.
Got rid of Distributions/readme.txt.

Cleaned up various things in the toolbox modules.

to pymactoolbox.h (where it should have been in the first place).

MacOS9isms.

later.

pre-carbon MacOS9 support.

and the biggest in size, but probably the easiest. Hunting through the
source code comes next.

release23-maint branch:
- Remember the scroll position when rebuilding the browser (as we do far
too often). Fixes #824430.
- Allow for the documentation to be inside PythonIDE as well as in
the Python.app inside the framework (the original location for 2.3).
- Updated version numbers
- In PythonIDE, add the Tools/IDE directory as the second entry in
sys.path in stead of as the first, leaving PythonIDE.app/Contents/Resources
as the first one.
- The code for setting the working directory to $HOME was both incorrect
and in the wrong place, fixed.
- On OSX the default location for IDE scripts is now
$HOME/Library/Python/IDE-Scripts.