Final tweaks and all tests passing... ready for 2.1.0 pyslha-2.1.0

Fix ambiguity between formatting a repr of a tuple and the tuple being an incompletely converted substitution list

File ignoring tweaks

Another test tweak

Test update: need to tweak output to make Anders' spectrum file work and note TODOs for 2.1.0

Adding Anders' example SLHA file


Happily unbroked once again

Another intermediate state recording

Urgh, I broked it

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