- reduces unexpected interactions between various make elements

- also add some comments about the side-effects

The Makefiles are now in the makefiles sub-directory

The "-f | -force" option in wmakeLnInclude is now "-u | -update" for
consistency with the other scripts.

The "Usage" entry in the headers is now consistently formatted in all
scripts.

Remove all .dep files from the object directory tree corresponding to the
current source derectory or remove only the .dep files referring to the
optionally specified [file].