If a package had version "*" and its name-version would be "name-*".
This would match all packages containing "name" in their name. Instead
the name-version is "name-*-*" so it matches any version of the package.
Keep main.go files under cmd/ and internal libraries under internal/.
This will allow us to add more exutables under cmd/ (whereas only one
was possible when main.go was kept in the root).
Signed-off-by: Tom Gundersen <teg@jklm.no>
