The former must remove stuff only to the end of recreating the same
condition available after unpacking upstream tarball. The latter can
delete "more", usually the stuff re-generable using autotools.

creating a top-level integrated with stublibs it's a tad anachronistic
these days :-)

revamp Makefile to use consistently $(NAME) and $(SHORTNAME) instead
of hard-coded "camlbz2" and "bz2"

- API change: get rid of labels
  Rationale: they were postfix, hence partial application was not
  possible anyhow.
- add missing ocamldoc function descriptions
- rearranged ocamldoc headers

Before this fix the OCaml-level errors where raised each time the BZ2
error value was tested, no matter what the result of the test was.
Now they get raised only if the BZ2 error is < 0, which precisely
states that an error actually occured.

- do not attempt to patch ld.so.conf