DEPL — Add "replace" parameter to installPackage

The RepositoryManager has two operations to install packages in the
Repository: installPackage() and createPackage(). But while the latter
has a "replace" parameter, to decide whether an existing package (with
the same installationName) shall be replaced or not, the former doesn't.
I don't see why this difference should exist.

Proposed resolution:

In section 6.5.1.2 (RepositoryManager operations), add a third "replace"
parameter of boolean type to the installPackage operation. Thus, change

installPackage (installationName: String, location: String)
Installs a package in the repository, under the given installation
name. Raises the NameExists exception if a configuration by this
name already exists. Raises the PackageError exception if an
internal error is detected in the package.

to

installPackage (installationName: String, location: String, replace:
Boolean)
Installs a package in the repository, under the given installation
name. If the replace parameter is true, an existing
PackageConfiguration
with the same name is replaced. If the replace parameter is false,
and if
a package with the same name exists in the repository, the
NameExists
exception is raised. Raises the PackageError exception if an
internal
error is detected in the package.

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