Added source predicate to make debugging messages more useful.
Call is not necessary if not dynamically creating a term to call.
In this case, error_handler is always called with the same number of
arguments.
Added goal_expansion (rewrite on the fly) hooks to translate
SWI-Prolog style call to an emulated version if "cross-compiling".
Corrected some syntax errors caused by the removal of superfluous debug
statements and also added common predicates from the compatability
library (which are used by all versions of Prolog) to the Web interface.
Does something.