set_value / add_entry reworking

Recording an intermediate state

Added tag pyslha-2.0.0 for changeset 9d728fb2889d

Version 2.0.0! pyslha-2.0.0

Fixing __str__ / __repr__ on Particle and Decay

Better newline handling in final SLHA output formatting

Adding a leading space to float formatting of positive numbers to improve alignment.

Extra thoughts about comment implementation

Clean-up of precision formatting in output.

Split writeSLHA implementation into distinct writeSLHA{Blocks,Decays}.

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