tl: add support for ##n and ##[i:j] from SVA
* spot/tl/formula.cc, spot/tl/formula.hh (formula::sugar_delay): New function to implement this operator as syntactic sugar. * spot/parsetl/parsetl.yy, spot/parsetl/scantl.ll: Parse it. * doc/tl/tl.tex: Document the syntactic sugar rules and precedence. * tests/core/sugar.test: Add tests. * NEWS: Mention this new feature.
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