backport 1.20

This update to my script for backporting Debian packages suppresses the normal initial checks in dpkg-buildpackage for build dependencies and the initial run of debian/rules clean before moving the package into the chroot for building. Previously, the build dependencies required to run the clean target had to be installed outside the chroot, which was sometimes annoying. Since backport just unpacked the source package and made automated changes, it's guaranteed to be clean and there's no need to run the clean target.

You can get the current version from my miscellaneous scripts page.