streamlined procedure; tut.tex: fixes by Tim Peters; libposix.tex:
added posix.fdopen; ext.tex: typos

date and addr parsing; string: force result of atof to float and
support atoi, atol, atof in strop; tzparcs: don't call test().

	as aifc.py and sunau.py.
sunau.py: small change in comment (au -> sunau).

sunau.py: should convert number of frames correctly to number of bytes
	when reading.

of prefix match

check for nice()
* Makefile.in: make python .PRECIOUS; define OPT=-O and pass it to
submakes

modules only when needed