Use debian to parse versions and selections.
This covers ordering of versions like -0,-1 in sequence plus many others
not available with semver. It is backward compatible as we do support
the same featureset as before as tests are passing (adding more actually
to cover interesting cases)
This is a breaking change as changes the way packages can be given as
arguments to luet.
From this change, the following applies:
- If a package string contains @, the right part is parsed as version
(e.g. foo/bar@1.1)
- If a package contains "/" and no "@", cat/name is applied (e.g.
foo/bar)
- If a package doesn't contain either, is implied its just a name
without category
- If a package contains "=" at the beginning, the gentoo parsing default
is being used ( e.g. =foo/bar-1.1 )
Fixes#154
