Updates since 0.2:
- Override: SourceOverride: replaced by (Deb|UDeb|Dsc)Override
- new command reoverride to reapply override information.
- sometimes be a bit more verbose
- new iteratedupdate command , which is a variant of 
  update but needs less memory.
- to ignore Release signature failures two --force's are needed now.

Updates since 0.1.1:
- _md5sums command got removed. New command to dump
  the contents of the files database is _listmd5sums
- --basedir (alias -b) will no longer override prior
  given values to --confdir, --listdir, ....
- fix nasty overflow bug
- write Release, Packages, and Sources files first
  to .new variants and move then all at once.
- new Options DebIndices DscIndices UDebIndices
  
