Bug#205960: Version comparing and ~

[Koblinger Egmont <egmont@uhulinux.hu>]

Package: apt
Version: 0.5.9

Around 0.5.5 apt introduced that the tilde character compares to be less
than anything else (including the end of the string), e.g.
3.0~rc1-1 < 3.0-1.  This is also the way dpkg compares version strings.

In apt 0.5.9 it seems to be gone/broken, it believes 3.0~rc1-1 is newer
than 3.0-1.

root# apt-get upgrade
Reading Package Lists... Done
Building Dependency Tree... Done
The following packages will be upgraded
  foobar
1 packages upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 0B/144kB of archives.
After unpacking 0B of additional disk space will be used.
Do you want to continue? [Y/n]
dpkg - warning: downgrading foobar from 3.0-1 to 3.0~rc1-1.
(Reading database ... 150244 files and directories currently installed.)
Preparing to replace foobar 3.0-1 (using .../foobar_3.0~rc1-1_i386.deb) ...
Unpacking replacement foobar ...
Setting up foobar (3.0~rc1-1) ...