simplifier: new LTL simplifications
if e is pure eventuality and g => e, then e U g = Fg if u is purely universal and u => g, then u R g = Gg Fixes #93. * doc/tl/tl.tex, NEWS: Document the rules. * spot/tl/simplify.cc: Implement them. * tests/core/reduccmp.test: Test them. * tests/core/det.test: Adjust.
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