* Add patch libtool.patch to get a newer libtool version (closes: #500317);

* Add patch libtool.patch to get a newer libtool version (closes: #500317);
  thanks to Kurt Roeckx for the bug report and the proposed solution.
* Add quilt framework (and README.source for compliance with Debian Policy
  3.8.0).
* debian/rules:
  - add a clean-stamp target to debian/rules in order to run `make distclean'
    before unpatching configure and friends
  - add test/autocutee.mk to dh_clean
  - remove separate `make distclean' for doc/ directory