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

set_value / add_entry reworking

Recording an intermediate state

Added tag pyslha-2.0.0 for changeset 9d728fb2889d

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