Various fixes for FZJ_BenchmarkSfin2/SANS_benchmark2

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Free-form text area

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

• Rectification of SPLIT level + %Example target
• Improved instr doc header
• Improved comp doc header

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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?)
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  • 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 patches to an existing 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 used the mctest utility to test the instrument (please attach mcviewtest report as screenshot in comments)
  • I have used the mcrun --c-lint "linter" and followed advice to remove most / all warnings that are raised

• My contribution contains something else

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

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Lint'ing reveals that the case of a failed fopen is not handled correctly in the comp.

CFLAGS=
DEBUG: CMD: /Users/peterwillendrup/micromamba/envs/mcstas-dev/bin/mcstas finished
INFO: Linting generated code: ./FZJ_BenchmarkSfin2.c
DEBUG: CMD: cppcheck ./FZJ_BenchmarkSfin2.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 FZJ_BenchmarkSfin2.c ...
Checking FZJ_BenchmarkSfin2.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...
FZJ_BenchmarkSfin2.c:18396:29: warning: If resource allocation fails, then there is a possible null pointer dereference: f2 [nullPointerOutOfResources]
    o2 = (fgets (line1, 80, f2) != NULL);
                            ^
FZJ_BenchmarkSfin2.c:18389:14: note: Assuming allocation function fails
  f2 = fopen ("humanserumalbumin.txt", "r");
             ^
FZJ_BenchmarkSfin2.c:18389:14: note: Assignment 'f2=fopen("humanserumalbumin.txt","r")', assigned value is 0
  f2 = fopen ("humanserumalbumin.txt", "r");
             ^
FZJ_BenchmarkSfin2.c:18396:29: note: Null pointer dereference
    o2 = (fgets (line1, 80, f2) != NULL);
                            ^
Checking FZJ_BenchmarkSfin2.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;ADJUSTABLE_ESS_PULSE=ADJUSTABLE_ESS_PULSE...

Will leave as is since the related datafiles are not even included with the test-instrument...