packages should not list their Section: as (implicitly) main

[geofft]

debathena-tex-bin (which should go away, see #590), the OpenAFS kernel modules (which should go away, see #243), the OpenAFS metapackages, libmail-expandaliases-perl, python-hesiod, and python-moira all show up in the "main" area of the repository in e.g. aptitude and other package browsers, because they don't have an area prefix in the Section: field in their control file. They should have a prefix of debathena/ or debathena-system/ as appropriate. (This may be all debathena/, but possibly some of these are debathena-system/.)