locally deactivated simproc defined_all (following afp/81a8bf702c09)

replaced ceiling brackets by guillemots (following afp/fb851cb1ca27)

isabelle update_cartouches -t;

simplified Let constructor

avoid nonterminal clash in syntax translation

remove Thm.transfer workaround made obsplete by cf2406e654cf

tuned lift_bnf's user interface for quotients

merged

lift BNF witnesses for quotients (unless better ones are specified by the user)

merged

additional lemmas about alw and suntil (by Michael Foster)

new examples of BNF lifting across quotients using a new theory of confluence,

merged

eliminated one redundant proof obligation in lift_bnf for quotients

made LFP operation more faithful to the implementation