science/PETSc: Update 3.14.1 -> 3.16.3

Reported by:	portscout

One more small cleanup, forgotten yesterday.
Reported by:	lwhsu

Remove # $FreeBSD$ from Makefiles.

math/petiga: Update g20200316 -> g20210307

Mark BROKEN: fails to configure

CMake Error at CMakeLists.txt:18 (include):
  include could not find load file:

    /usr/local/lib/petsc/conf/PETScBuildInternal.cmake

Reported by:	pkg-fallout

math/petiga: Update g20180518 -> g20200316

PR:		240997
Submitted by:	takefu@airport.fm (update to an earlier revision)

Add USES=xorg USES=gl, ports categories m

Add USES=xorg and USES=gl to ports in categories starting with 'm'
While here, try to sprinkle other USES (mostly gnome and sdl) as needed.

Bump PORTREVISION for ports depending on the canonical version of GCC
as defined in Mk/bsd.default-versions.mk which has moved from GCC 8.3
to GCC 9.1 under most circumstances now after revision 507371.

This includes ports
 - with USE_GCC=yes or USE_GCC=any,
 - with USES=fortran,
 - using Mk/bsd.octave.mk which in turn features USES=fortran, and
 - with USES=compiler specifying openmp, nestedfct, c11, c++0x, c++11-lang,
   c++11-lib, c++14-lang, c++17-lang, or gcc-c++11-lib
plus, everything INDEX-11 shows with a dependency on lang/gcc9 now.

PR:		238330

Related to revision 499061 bump ports with USES=fortran to have them
benefit from the improved situation where libgcc_s is only used when
absolutely necessary.

Suggested by:	tijl

Change cmake default behaviour to outsource.

Ports that build out of source now simply can use "USES=cmake"
instead of "USES=cmake:outsource". Ports that fail to build
out of source now need to specify "USES=cmake:insource".

I tried to only set insource where explictely needed.

PR:		232038
Exp-run by:	antoine

Bump PORTREVISION for ports depending on the canonical version of GCC
defined via Mk/bsd.default-versions.mk which has moved from GCC 7.4 t
GCC 8.2 under most circumstances.

This includes ports
 - with USE_GCC=yes or USE_GCC=any,
 - with USES=fortran,
 - using Mk/bsd.octave.mk which in turn features USES=fortran, and
 - with USES=compiler specifying openmp, nestedfct, c11, c++0x, c++11-lang,
   c++11-lib, c++14-lang, c++17-lang, or gcc-c++11-lib
plus, as a double check, everything INDEX-11 showed depending on lang/gcc7.

PR:		231590

science/PETSc: Update 3.9.4->3.10.1; math/py-petsc4py: Update 3.9.1->3.10.0;
math/slepc: Update 3.9.2->3.10.0; math/py-slepc4py: Update 3.9.0->3.10.0

Bump math/sundials and math/petiga.
On commit because they depend on each other and don't build unless versions
match.

Change 10 ports from net/mpich2 to net/mpich

mpich2 is the obsolete version 2.x, mpich is at the current version 3.x

science/triqs science/PETSc math/py-slepc4py math/slepc math/py-petsc4py
math/petiga math/sundials cad/elmerfem math/blocksolve95 math/spooles

math/petiga: Add the xplanation to pkg-descr

Bump PORTREVISION for ports depending on the canonical version of GCC
in the ports tree (via Mk/bsd.default-versions.mk and lang/gcc) which
has now moved from GCC 6 to GCC 7 by default.

This includes ports
 - featuring USE_GCC=yes or USE_GCC=any,
 - featuring USES=fortran,
 - using Mk/bsd.octave.mk which in turn features USES=fortran, and those
 - with USES=compiler specifying one of openmp, nestedfct, c11, c++0x,
   c++11-lib, c++11-lang, c++14-lang, c++17-lang, or gcc-c++11-lib.

PR:		222542

math/petiga: Fix build on 10

Added USES=compiler:c++14-lang.
See https://reviews.llvm.org/rL239883.
Thanks to Jan Beich!

Reported by:	jbeich

New port: math/petiga: Framework for High Performance Isogeometric Analysis