raco setup: fix for relative & multiple paths in PLTCOMPILEDROOTS

Fix the part of `raco setup` that deletes ".zo" files that
have no corresponding source.
document and deprecate 3-argument call to default module name resolver

Calling the default module name resolver with three arguments logs an
error message. The intent is that 3-argument support will be removed,
eventually.
syntax/docprovide: fix direct call to module name resolver

Also, deprecate the library.
mzcom doc improvements
fix many more 3-argument calls to the module name resolver