Title: Macro support for Generalize, part II. (funexp replacement)
Goal: accept
Parameters: [{file,"gen_mac2.erl"},{posrange,{95,97}},{varname,"T"}].
Documentation: Generalize "2*B" in myfun/1 using a fun expression replacement, where myfun is used inside a macro body. The transformation should insert the funexp with body "2*B" into the argument list of the application inside the macro definition, and modify the syntax tree accordingly.
