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The performance gain seems neglectable, unfortunatelly...

This better seals off their definition. Although it did not give
much of a speedup, I think it is conceptually nicer.

this makes it slightlymore annoying to use because we have to elliminate the box. one more reason to have a proof mode ;-)

This avoids ambiguity with P and Q that we were using before for both
uPreds/iProps and indexed uPreds/iProps.

- The direction of big_sepS_later and big_sepM_later is now like later_sep.
- Do not use generated variables in the proofs.

This prevent the assumption from being dragged into lemmas that do not even need it

(missed practically everything in the previous commit)

Also, make our redefinition of done more robust under different
orders of Importing modules.