Estimated hours taken: 1
Since NU-Prolog hasn't been capable of executing the compiler for a long time
now, I have removed the .pp files and replaced them with .m files.
code_gen, mercury_compile, optimize:
Remove NU-Prolog specific code.
Mmake:
Don't refer to the .pp files.
dnf:
Add the capability of transforming all procedures regardless of
markers. This will be useful when generating idiomatic Prolog code.
mercury_to_goedel, polymorphism:
Fix comments.
