SummationByParts does not ensure unique gobal function names

@tootle reported an issue on the mailing list: http://lists.einsteintoolkit.org/pipermail/users/2023-February/008840.html

(One of the) underlying issues is that SummationByParts does not prefix the (globally visible) Fortran subroutines with the SBP_ prefix it uses (and must use) for globally visible symbols.

This also makes CCTK_FNAME fail due to incorrect usage (the name it acts on must have mixed case).

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