CONFIG: relocate WM_PROJECT definition in bashrc, cshrc

- locate where the user is less tempted to change it (#1515).
  It really should be considered an invariant environment variable.

STYLE: wmake -help information to stdout, die errors to stderr

wmake/wclean

@@ -46,7 +46,6 @@ usage() {
 
 Usage: $Script [OPTION] [dir]
        $Script [OPTION] target [dir [MakeDir]]
-
 options:
   -a | -all         Same as the 'all' target
   -s | -silent      Ignored - for compatibility with wmake