* debian/control.m4, debian/control: make upgrades from Lenny work without broken packages or hard decisions. (gnat-4.4): replace all previous versions of gnat-X.Y. (libgnat{vsn,prj}4.4-dev): - Replace the corresponding 4.3 package in addition to Conflicting with it. - Suggest the -dbg package, too. (libgnat{vsn,prj}4.4-dbg): - Depend on the -dev package, too. - Do not recommend gnat-gdb, superseded by gdb. (libgnatprj4.4-dbg): do not recommend libgnatprj-dev, no longer in the archive.