Reexported ref_context in refactor.pl
Minor bug fix in head replacer
Improved goal replacer to allow scan meta arguments, because under certain
conditions they can not be reached by current implementation of
expand:expand_goal/4
Fixed a bug in expand_if_required/6, ''/2 must set the right module before to call expand/4
Fake arguments added by r_goal_expansion/2 should be removed just before to
perform the term substitution

r_goal_expansion and do_r_goal_expansion where renamed to into_goal_expansion/2
and do_goal_expansion/2 respectively