Initial work on the support of the binary files repository

It introduces a command "upload" to explicitly upload tarballs to the
repository and update the list on svn (the file SOURCES/sources). Also a
"del" command, to remove the reference to the file in the sources file. An
another "up", to pull possibly new tarballs from the binaries repository.

The command sync will automatically mark the new files that should go the
binaries repository. They should be uploaded with ci.

With the current code, packages can have tarballs gradually migrated as
tarballs of newer versions will appear.

In this implementation markrelease is required to be run in the same
machine of the repository (or at least should have direct fs access to it),
as it works by performing plain "cp"

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