Version number in package_latest() for Debian is not big enough

According to Debian versioning policy (https://www.debian.org/doc/debian-policy/ch-controlfields.html, #5.6.12), there is an epoch part of the version which is assumed to be 0 if omitted. This way version '9999999999' is actually '0:9999999999' which is lower than '1:0.0.1'. Please see attached patch which should correct this problem by replacing '9999999999' with '999999999:9999999999'.