Add VersionList ([]Version) implementing sort.Interface.
Changed hackedRefs to also return a VersionList holding all valid versions for a repo.
Change Repo struct to hold parts and added methods to construct useful strings from those parts.
Comment out the whole nameHasversion() thingie. It was noted as obsolte made it harder to create clean Repo struct.

Caused a panic when repo could not be reached.

Handle version overflow better. Add missing return.

This reverts commit 517a7be269.

This reverts commit f4151cb744.

This reverts commit fd83e1645f.

By using strconv, value out of range problems are catched and a
version part thats too high will not cause trouble.