Remove use of ROUser -- both auric and pandora have select granted to public(everyone), and postgres 7.1's sameuser needs it.

work around broken arch: aany packages conflicting with arch: all ones.  make 2nd argument optional and default to 'r' for open_file

Ensure a sane minimum set of fields in the .dsc and ensure the .dsc version matches the .changes version.

fix is_nmu test for namless changed-by.  use subtree for options.  add logging.  less reject_message truncation.  ensure format in .dsc is 1.0.  don't try to obtain lock in no-action mode