Clarified some comments.

- Improved version of NeXT patching of $OPT
- Added new option --with-libs='lib1 lib2 ...'
- Define _REENTRANT when posix threads are in use

Now all we need to do is do the same for beta1 compared to 1.3.

(But hypot() should really be defined in a separate file, triggered by
configure.)

- "make install" now depends on "make altinstall" for most of the
work, and the binary is always installed as python<version> first,
with a hard link to python made by "make bininstall".

- Create the machine dependent directory if it doesn't exist, and
attempt to run the regen script in it (unfortunately this will fail
unless you have h2py in your $PATH - help!)

after DESTPATH.

sys.argv, insert "".  Note that "." is removed as a default component
of the path (see changes to getpath.c and Setup.in).

Documented insertion of script directory in path.
Updated author's address.
Changed MAILING LIST section to INTERNET RESOURCES.

Added exp(z).