remove lcsymtacs (github issue #666) The lcsymtacs structure is regarded superseded as it plainly is a shorthand for opening the following modules: Abbrev HolKernel boolLib Tactic Tactical BasicProvers simpLib Rewrite bossLib Thm_cont
upgraded regexp compiler to use binary-map set to represent worklist; also proved an optimization to regexp_compareW; moved to new syntaxes for HOL stuff (Theorem, Definition, etc)