re-ordered SMT normalization code (eta-normalization, lambda abstractions and partial functions will be dealt with on the term level); added simple trigger inference mechanism; added syntactic checks for triggers and quantifier weights; factored out the normalization of special quantifiers (used to be in the eta-normalization part); normalization now unfolds abs/min/max (not SMT-LIB-specific); rules for pairs and function update are not anymore added automatically to the problem; more aggressive rewriting of natural number operations into integer operations (minimizes the number of remaining nat-int coercions); normalizations are now managed in a class-based manner (similar to built-in symbols)

added option to enable trigger inference; better documentation of triggers and SMT available options