Convert all USE_FORTRAN=yes to "USES=fortran, USE_GCC=yes". In most cases
USE_GCC=yes has been omitted though.
Remove USE_FORTRAN handling from bsd.port.mk and bsd.gcc.mk.
Minor cleanups in some ports like USE_GMAKE, NOPORTDOCS,...
Approved by: portmgr (bdrewery)
Add new ports biology/plink  and biology/plinkseq :
PLINK is a free, open-source whole genome association analysis toolset.
PLINK/SEQ is an open-source C/C++ library for working with human
genetic variation data.
PR: ports/171918 
PR: ports/171922 
Submitted by: Jason Bacon <jwbacon at tds.net>