Merge commit 'lamby/deb-src-3.0-sqla' into merge

* commit 'lamby/deb-src-3.0-sqla': (29 commits)
  Drop lzma support.
  Only enable not-"1.0" formats on t-p-u and unstable and experimental.
  Reject uploads that contain a native tarball and a diff.
  dak heresy
  Fix reference to cls.requires.
  Add unittest.main() to test_regexes.
  Add shebang to regex tests.
  Simplify rejecting logic
  Avoid if/elif/elif.. with lookup table.
  Use loop to check for illegal duplication of file types in .dsc
  Use a collections.defaultdict to avoid boilerplate definitions.
  Correct grammar when rejecting a package with insufficient files.
  Require source formats to have a name and interpolate it when returning msgs
  Compare with None using "is", not "=="
  Remove has_ prefix inside srcformats.
  Don't pass dsc_filename to reject_msgs; prepend it in check_dsc_files.
  Move rejection message generation into srcformats
  Add regex to match .dsc "Format: lala" value and compile it on creation.
  Add SourceFormat class and track definitions with metaclass
  Make dbconn.get_suite_src_formats use @session_wrapper.
  ...

Signed-off-by: Joerg Jaspert <joerg@debian.org>