Re-enable MUSIC support in NEURON

[ohm314]

This relates to #1894
#2092 extends this to dynamic loading when NRN_ENABLE_MPI_DYNAMIC=ON
#2096 extends that to wheels.

MUSIC support was inadvertently dropped when we switched to CMake. We're fixing this oversight now. This is still a bit work in progress but we have added the FindPackage module and most of the CMake piping to get things built. Mostly what's left to do is:

• Figure out how to deal with deprecated MPI C++ interface
• Check how this behaves when building a wheel. (see Wheel that supports MUSIC if installed. #2096)
• Check if OS/table.h can be replaced with a standard data structure
• Check if we should link against the .so or .a library.

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[nrnhines]

@mdjurfeldt You mentioned in the README (Now in nrn/test/music_tests/README) that

(For some reason, it is not possible to add -nobanner for test3.)

I don't know details about gnu_getopt but if you skip one more...

-optlist, args = gnu_getopt(argv[3:], "g:")
+optlist, args = gnu_getopt(argv[4:], "g:")

works when

argv= ['nrniv', '-nobanner', '-music', '-python', 'test3.py', '-g', '1']

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[nrnhines]

@ohm314 What is your opinion about merging this when it passes CI? I'm working toward a mergable #2096 for wheels, but that could still take a while.

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