pkg, info: remember installed packages "replaces"
"replaces" is now turned to a full dependency type list, so you can make package overwrite files only certain versions of the package (though, we should probably take this into account already at solution calculation phase). Also make 'info --replaces' print the "replaces" of the package. This is in preparation for the policy package support, which still requires "replacement priority" field to decide which packages' files get the preference.
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