Set MARK_JOBS_UNSAFE=yes.

If that's not done sometimes not all object files are built before the final
.a is created.
. Support staging
. s/USE_GMAKE/USES=gmake/
. New LIB_DEPENDS syntax

Approved by:	portmgr (blanket)
- Fix the plist when the CFITSIO option is on.
- Use the new OPTIONS helpers to simplify the Makefile.

Related to both, also stop automatically turning the CFITSIO option on when
libcfitsio.so is installed: wcslib has had proper --with{out}-cfitsio
options since version 4.4.4.

This will turn off CFITSIO support for most people and indirectly fix their
builds with astro/cfitsio-3.360-1 [1]. If people do choose to have it on,
ports/189487 needs to be committed, otherwise there will be plist errors
because wcslib's configure script will not be able to detect that cfitsio is
installed and can be used.

[1] http://lists.freebsd.org/pipermail/freebsd-ports/2014-May/092070.html
- Add staging support
- Define DOCS option
Support stage
Support stage
USES=tar:bzip2
Support stage
Support stage
Support stage
Support stage
- Fix dependencies.  devel/qt4-linguist is not needed at run-time. [1]
- Fix VPX option to actually enable video capture for FreeBSD. [2]

PR:		ports/189417 [1]
PR:		ports/189430 [2]
Support stage
Support stage
Support stage
Use @sample
Support stage
USES=tar:bzip2
Support stage
Support stage
. Handle spaces in CC, CXX or HOST_CC [1]
. Convert a space to a tab [2]
. Pet portlint by changing /nonexistent to ${NONEXISTENT} [2]

PR:		189385 [2]
Submitted by:	Dominic Fandrey <kamikaze@bsdforen.de> [1]
		Takefu <takefu@airport.fm> [2]