- pkg: pack does not recognize compressed man pages, so launching
  pkg pack twice makes them disappear from the list of dependencies.
- preinit: shoud provide a prompt if init fails ?
- finish "pkg release" : problems when releasing a package which is
  already released in another arch.
- pkg: how to build several packages from one build.cfg at once ?
  eg: ssh, ssh-tcpwrap ?
- pkg: cannot understand a package named xxx-v1.2.3 nor xxx.1.2.3
- pkg: release should to clean + setpkg + mark files R/O