add constructors PE_Matches and IsConstructor in module syntax

don't create a list of arrays with variable references for each case alternative,
instead allocate a few arrays and reuse these, unify and combine the reference counts after each alternative,
optimize functions unify_counts and combine_counts,
don't sort the case alternatives twice

adjust imports

remove import of StdCompare in checksupport.dcl,
changed some other imports

because function pointers for generated functions are stored in the Component,
they can be found without searching the new functions list

get_linearity_info, get_linearity_info_of_pattern, get_var_index, set_linearity_info

(>100 m)

s/\<mod_name\>/mod_ident/g
s/\<ps_field_name\>/ps_field_ident/g
s/\<ps_selector_name\>/ps_selector_ident/g
s/\<pc_cons_name\>/pc_cons_ident/g
s/\<class_name\>/class_ident/g
s/\<gen_name\>/gen_ident/g
s/\<gen_member_name\>/gen_member_ident/g
s/\<gc_name\>/gc_ident/g
s/\<gc_gname\>/gc_gident/g
s/\<fs_name\>/fs_ident/g
s/\<td_name\>/td_ident/g
s/\<fv_name\>/fv_ident/g
s/\<var_name\>/var_ident/g
s/\<type_name\>/type_ident/g
s/\<symb_name\>/symb_ident/g
s/\<tv_name\>/tv_ident/g
s/\<av_name\>/av_ident/g
s/\<me_symb\>/me_ident/g
s/\<ft_symb\>/ft_ident/g
s/\<fun_symb\>/fun_ident/g
s/\<cons_symb\>/cons_ident/g
s/\<sd_symb\>/sd__ident/g

extended unused args analysis
improved strictness for case instantiation
dead code removal

Make all dictionary arguments active

improve refcounts for case