* Modules/{Setup.in,Makefile.pre.in}: renamed some modules to

shorter names (dropped the "module" from the name): sunaudiodev,
	imgformat, audioop, imageop, imgfile

	* Modules/stropmodule.c (strop_rindex): make rindex('abc', '') do
	the right thing (i.e. return 3 instead of 0)

	* Modules/socketmodule.c: disabled allowbroadcast() socket method