- Replace ${MASTER_SITE_FOO} with FOO.
- Merge MASTER_SITE_SUBDIR into MASTER_SITES when possible. (This means 99.9%
  of the time.)
- Remove occurrences of MASTER_SITE_LOCAL when no subdirectory was present and
  no hint of what it should be was present.
- Fix some logic.
- And generally, make things more simple and easy to understand.

While there, add magic values to the FESTIVAL, GENTOO, GIMP, GNUPG, QT and
SAMBA macros.

Also, replace some EXTRACT_SUFX occurences with USES=tar:*.

Checked by:	make fetch-urlall-list
With hat:	portmgr
Sponsored by:	Absolight

With hat:	portmgr

I am not touching the husky ports with a 10 foot pole.

atp:
	stage, improve pkg-message
crashmail:
	stage
diablo:
	too wacky to stage, but convert WITH_* to OPTIONS, unmute
	commands that shouldn't be muted, use :MDOCS
fidogate-ds:
	stage, OPTIONS, treat examples as EXAMPLES, not DOCS, handle
	/var/* in the plist properly
golded+:
	stage, OPTIONS, protect examples behind %%PORTEXAMPLES%%
nntpbtr:
	this was an unbelievably PITA
	stage, add missing prototypes, add missing return types,
	rename patch files to what they actually patch
nntpcache:
	stage support, required lots of Makefile.in patching,
	call submakes correctly, handle config files properly
nzbperl:
	stage, use OPTIONS, remove obsolete pkg-message
papercut:
	stage, handle config file properly
py-pynzb:
	stage, use OPTIONS helper to avoid bsd.port.options.mk inclusion
s-news:
	stage
slrnconf:
	stage
slrnface:
	stage, install required files to datadir, not examplesdir,
	generate proper pkg-message
sn:
	stage