RF: New CUDACXXFLAGS

See merge request !34

into a CUDA lib / exe - so that USRNVCCFLAGS, and CUDA include paths are added
to compiler flags for these targets.

RF: Set -std=c++14 for nvcc-compiled code - CUDA 11.0 is the earliest to support c++17

See merge request !33

support c++17

Mnt/c++17

See merge request !32

CI: Don't run CI tests on tags or master branch

See merge request !31

Mnt/fsldevdir rpath

See merge request !30

Mnt/post 606

See merge request !29

RF: Better way of adding -install_name option

See merge request !28

evaluated against $@="", so was matching all targets

MNT: rpath

See merge request !27

specified in environment. This is to support local development, so that
exes can be executed from $FSLDIR/src/<project>/<exe> and that libs in
$FSLDIR/src/<project>/ will take precedence over those in $FSLDIR/lib/

default since ~2010. Explicitly set rpath to pwd, pwd/../lib, and
$FSLDIR/lib. Set install name for shared libs on macOS so that executables
will refer to them via rpath.

These last two changes are explicitly performed by conda build, but are needed
for stand-alone/development compilation

MNT: note about compute capabilities

See merge request !26

Mnt/cuda compute capabilities

See merge request !25