DEPL — createPackage operation for RepositoryManager

There is no way for a client to put a package into the reposi-
tory at runtime, without creating an XML-based, ZIP'd package.
It might be useful to have a createPackage (name, label, package,
baseURL) in the Repository Manager. This method would do less
than the installPackage methods. Relative URLs in the package
would be interpreted according to the baseURL.

Proposed resolution:

In section 3.5, "Component Management Model", add a createPackage
operation to the RepositoryManager interface:

createPackage (name: String, label: String,
package: ComponentPackageDescription,
baseLocation: String)

Installs a ComponentPackageDescription in the repository,
assigning the given name and label to the new Package-
Configuration. Relative locations in elements of the package
are interpreted according to the baseLocation. Raises the
PackageError exception if an internal error is detected
in the package.