MNT: Suppress output from depend.mk rule

See merge request !43

RF: Go back to having depend.mk logic inline, rather than in separate script

See merge request !42

as passing/escaping variables with special characters is far too painful.

Bf/permissions

See merge request !41

ENH: Auto-dependency generation support for CUDA files.

See merge request !40

is present. CUDA outputs can be directed into a separate directory, which can
be specified via CUDABUILDDIR

Support multi threading on linux

See merge request !39

a build directory. Project Makefiles can set a BUILDDIR variable to their
build directory - this will be used in the generated target names

Mnt/fsldevdir

See merge request !38

RF: Also need to drop -L flags that are set in environment, in addition to -rpath flags

See merge request !37

to -rpath flags

RF: Work around issue with c++17 and older versions of libxml++.

See merge request !36

define here rather than in every project which uses ciftilib (which in turn
uses libxml++)

Bf/cudacxxflags

See merge request !35

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.