pow(x,y,z) == pow(x,y)%z, but without incurring overflow

        the exception returned by a syntax error (when reported) would
        contain an object with refcnt zero!
MPW changes

        pow(x,y,z) == pow(x,y)%z, but without incurring overflow
Correct problems found by THINK C 6.0

Add cast for Lance

        literal (for "completeness" test)

        CHILD(n,i) for i >= NCH(n)

MPW fixes

urllib.py: '+' is not always safe (even though the RFC says so :-( )
whrandom.py: throw away top bits of time to avoid overflow on Mac
(where times can be negative)

audioop.c: fix for MPW
config.c.in: save original argc/argv for Lance
rotormodule.c: new coding conventions
timemodule.c: add casts for Lance

tokenizer.c: move tok_backup call around

versions -- they now share config.c and config.h, and statting is
always done through macstat.[ch] (THINK's <stat.h> defines funny
constants).  Also the configuration of stdwin is done differently: you
have to define USE_STDWIN to the compiler prefix.

	env at configure time and will then be put in all Makefiles as
	default
	* */Makefile*.in: remove lib*.a before adding to it

	I'd done that already?!); disable gdbm by default
	* configure.in, */Makefile*.in: OPT can now be specified in the
	env at configure time and will then be put in all Makefiles as
	default
	* */Makefile*.in: remove lib*.a before adding to it

	as file.C or file.cc or file.c++; C files can be given as file.c
	(instead of file.o, which is still supported)

	literal (for "completeness" test)
	* */Makefile*.in: remove lib*.a before adding to it

	parsing

	* Lib/macpath.py: don't return trailing colon for dirname()
	(XXX won't do for volume names -- but otherwise glob(':*:*.py')
	loops forever)
	* Lib/traceback.py: print SyntaxError correctly
	* Lib/stat.py: moved to posixstat.py; added macstat.py which has
	the constants for the Mac; and created new stat.py which includes
	the right one
	* Lib/urllib.py: fix caching bug (by disabling the cache)

	the cache!)

	millisleep(); document clock()

	* Doc/ref6.tex (section{Assignment statements}): added warning
	about overlaps in lhs of assignment (e.g. "i, x[i] = 1, 2")

Makefile.in: remove lib*.a before creating new one.

Pass value of OPT from configure environment to Makefile.
Add check for limits.h.
Use <directory>/libreadline.a instead of -lreadline.