forward-port from rel-2-2-dev: (Updated modules/executables list, cleaned up output.
Output now specifies that $PATH is being searched for executables, and
lists the contents of $PATH. Same with @INC. It's a little easier to
tell if a module/executable has not been found: The "found" lines are
prefixed by some space, which makes the not found '**' prefix stand out.
When a module fails to load, but it's not because it wasn't found, the
error message is given.)