simplify: some new simplification rules
For #263, reported by Mikuláš Klokočka. G(a & Xe1 & F(b & e2)) = G(a & e1 & Fb & e2) F(a | Xu1 | G(b | u2)) = F(a | u1 | Gb | u2) * spot/tl/simplify.cc: Implement the rules. * doc/tl/tl.tex, NEWS: Document them. * tests/core/reduccmp.test, tests/core/eventuniv.test: Add test cases. * tests/core/det.test, tests/core/ltl2tgba2.test: Adjust to expect smaller automata. * THANKS: Add Mikuláš.
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