Expand Monitor_nD to 10 uservars + other work on monitors

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Free-form text area

Please describe what your PR is adding in terms of features or bugfixes:

Work on monitors:

• Monitor_nD uservars expanded from 3->10 uservars ([FEATURE]: Increase number of Monitor_nD user vars #2391)
• Naïve test instrument(s) added for McStas and McXtrace
• Correction of wording / parameters in Flex_monitors, McStas and McXtrace
• Removal of PreMonitor_nD mentions in comps and docs -> use USERVARS

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Development OS / boundary conditions

Please describe what OS you developed and tested your additions on, and if any special dependencies are required:

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PR Checklist for contributing to McStas/McXtrace

For a coherent and useful contribution to McStas/McXtrace, please fill in relevant parts of the checklist:

• My contribution includes patches to an existing component file

  • I have used the mcdoc utility and rendered a reasonable documentation page for the component (please attach as screenshot in comments!)
  • I have ensured that basic use of the component is OK (e.g. an instrument using it compiles?)
  • I have used the mctest utility to test one or more instruments making use of the component (please attach mcviewtest report as screenshot in comments)
  • I have used the mccode-clangformat tool to apply the standard McCode component indentation scheme
  • I have used the mcrun --c-lint "linter" and followed advice to remove most / all warnings that are raised

• My contribution includes a new instrument file

  • I have used the mcdoc utility and rendered a reasonable documentation page for the instrument (please attach as screenshot in comments!)
  • I have ensured that basic use of the instrument is OK (e.g. it compiles?)
  • ... and provided reasonable default parameters in that instrument that produce reasonable output
  • ... and maybe even added a %Example: line to describe expected behaviour
  • I have used the mcrun --c-lint "linter" and followed advice to remove most / all warnings that are raised
  • My new instrument is added within the examples hierarchy in a folder in the style of examples/ESS/New_stuff/New_stuff.instr
  • My new instrument has a new, unique filename, not clashing with existing example instruments
  • My new instrument requires a data/input file. If the datafile is specific for my instrument I have left it in the same example folder, but if general use I have placed it in the global data folder.

• My PR is meant to fix a specific, existing issue

  • I have indicated the issue number here: [FEATURE]: Increase number of Monitor_nD user vars #2391
  • I have added documentation for the fix and possible side effects

• My contribution contains something else

  • Explanation is added in free form text above or below the checklist

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Docs look fine, here is a a sample:

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The failing tests of McXtrace / conda / windows are due to #1579

The failing test of McStas / non-conda-windows is a missing dependency in the CI… (jinja2 for mcviewtest)

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McXtrace has a couple of (likely unrelated) instruments with output that is off:

McStas looks all green for the PR-related instruments:

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No noise from the linter based on the McStas side:

INFO: Linting generated code: ./Test_Monitor_nD.c
DEBUG: CMD: cppcheck ./Test_Monitor_nD.c --check-level=exhaustive --force -DMCDEFAULT_NCOUNT=1000000 -UMC_PORTABLE -DND_BUFFER=10000000 -UNOABSORB_INF_NAN -UOMPI_MPI_H -DSIGABRT -DSIGBREAK -DSIGBUS -DSIGPE -DSIGHUP -DSIGILL -DSIGINT -DSIGKILL -DSIGUSR1 -DSIGUSR2 -DSIGPIPE -DSIGQUIT -DSIGSEGV -DSIGTRAP -DSIGURG -DSIGFPE -DSIGKILL -DSIGTERM -UTEST -UUSE_OPENCL -UWIN32 -UOPENACC -UGCCOFFLOAD -U_MSC_VER -U_MSC_EXTENSIONS -U_WIN32 -UWIN32 -D__unix__ -UDANSE -UFUNNEL -UMC_ANCIENT_COMPATIBILITY -UMC_POL_COMPAT -UNEUTRONICS -Uisnan -Uisinf
Checking Test_Monitor_nD.c ...
Checking Test_Monitor_nD.c: MCDEFAULT_NCOUNT=1000000;ND_BUFFER=10000000;SIGABRT=1;SIGBREAK=1;SIGBUS=1;SIGPE=1;SIGHUP=1;SIGILL=1;SIGINT=1;SIGKILL=1;SIGUSR1=1;SIGUSR2=1;SIGPIPE=1;SIGQUIT=1;SIGSEGV=1;SIGTRAP=1;SIGURG=1;SIGFPE=1;SIGKILL=1;SIGTERM=1;__unix__=1...
Checking Test_Monitor_nD.c: MCDEFAULT_NCOUNT=1000000;ND_BUFFER=10000000;SIGABRT=1;SIGBREAK=1;SIGBUS=1;SIGPE=1;SIGHUP=1;SIGILL=1;SIGINT=1;SIGKILL=1;SIGUSR1=1;SIGUSR2=1;SIGPIPE=1;SIGQUIT=1;SIGSEGV=1;SIGTRAP=1;SIGURG=1;SIGFPE=1;SIGKILL=1;SIGTERM=1;__unix__=1;OFF_LEGACY=OFF_LEGACY...
Checking Test_Monitor_nD.c: MCDEFAULT_NCOUNT=1000000;ND_BUFFER=10000000;SIGABRT=1;SIGBREAK=1;SIGBUS=1;SIGPE=1;SIGHUP=1;SIGILL=1;SIGINT=1;SIGKILL=1;SIGUSR1=1;SIGUSR2=1;SIGPIPE=1;SIGQUIT=1;SIGSEGV=1;SIGTRAP=1;SIGURG=1;SIGFPE=1;SIGKILL=1;SIGTERM=1;__unix__=1;USE_MPI=0...
Checking Test_Monitor_nD.c: MCDEFAULT_NCOUNT=1000000;ND_BUFFER=10000000;SIGABRT=1;SIGBREAK=1;SIGBUS=1;SIGPE=1;SIGHUP=1;SIGILL=1;SIGINT=1;SIGKILL=1;SIGUSR1=1;SIGUSR2=1;SIGPIPE=1;SIGQUIT=1;SIGSEGV=1;SIGTRAP=1;SIGURG=1;SIGFPE=1;SIGKILL=1;SIGTERM=1;__unix__=1;USE_MPI=USE_MPI...
Checking Test_Monitor_nD.c: MCDEFAULT_NCOUNT=1000000;ND_BUFFER=10000000;SIGABRT=1;SIGBREAK=1;SIGBUS=1;SIGPE=1;SIGHUP=1;SIGILL=1;SIGINT=1;SIGKILL=1;SIGUSR1=1;SIGUSR2=1;SIGPIPE=1;SIGQUIT=1;SIGSEGV=1;SIGTRAP=1;SIGURG=1;SIGFPE=1;SIGKILL=1;SIGTERM=1;__unix__=1;USE_MPI=USE_MPI;USE_NEXUS=USE_NEXUS...
Checking Test_Monitor_nD.c: MCDEFAULT_NCOUNT=1000000;ND_BUFFER=10000000;SIGABRT=1;SIGBREAK=1;SIGBUS=1;SIGPE=1;SIGHUP=1;SIGILL=1;SIGINT=1;SIGKILL=1;SIGUSR1=1;SIGUSR2=1;SIGPIPE=1;SIGQUIT=1;SIGSEGV=1;SIGTRAP=1;SIGURG=1;SIGFPE=1;SIGKILL=1;SIGTERM=1;__unix__=1;USE_NEXUS=0...
Checking Test_Monitor_nD.c: MCDEFAULT_NCOUNT=1000000;ND_BUFFER=10000000;SIGABRT=1;SIGBREAK=1;SIGBUS=1;SIGPE=1;SIGHUP=1;SIGILL=1;SIGINT=1;SIGKILL=1;SIGUSR1=1;SIGUSR2=1;SIGPIPE=1;SIGQUIT=1;SIGSEGV=1;SIGTRAP=1;SIGURG=1;SIGFPE=1;SIGKILL=1;SIGTERM=1;__unix__=1;USE_NEXUS=USE_NEXUS...

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Down to only McXtrace + MSVC on windows via conda failling due to #1579. Merge.