What to do on new upstream?

If there is no debian/watch files, then download the new tarball into ../tarballs/.
Then modify debian/changelog:
dch -v 0.2-1

Finally, add and/or edit debian patchs:
bzr bd-do "dpatch-edit-patch 01-fix-build"

Do not forget to add the new patch in debian/patches/00list!

Build the package:
bzr builddeb --builder=debuild

If there are no Lintian warnings, you can then update the branch:
bzr push lp:~aeromodelling-maintainers/aeromodelling-project/avl-debian