Migrate Redmine.pm from Digest::Sha1 to Digest::Sha
The helper perl module to integrate subversion repositories authentication
with redmine uses Digest::SHA1. It would be far better to use Digest::SHA,
since it's faster and maintaned.
Digest::SHA1 has been removed from Debian distributions, for example.
The migration is quite simple, it's enough to rename all Digest::SHA1 to