renameWorkspace( oldName, newName )
    Renames a workspace.

    The new workspace name must not already exist. The only exception is when
    the old name and the new name are the same; in which case, invoking this
    function is a non-operation.

    As a 'base' workspace must always exist, when renaming the 'base' workspace,
    variables from the 'base' workspace are simply copied to a new workspace and
    the 'base' workspace cleared of user-defined variables.

    Parameters
    ----------
    oldName: string
        Name of workspace to rename.

    newName: string
        New workspace name.

    Examples
    --------
    // Create a new workspace:
    > workspace( 'foobar' );
    > var x = 3.14;

    // List current workspaces:
    > workspaces()

    // Switch to another workspace:
    > workspace( 'barfoo' );

    // List current workspaces:
    > workspaces()

    // Rename the first workspace:
    > renameWorkspace( 'foobar', 'beepboop' );

    // Check the updated list of workspaces:
    > workspaces()

    // Switch to the renamed workspace:
    > workspace( 'beepboop' );

    // Confirm that workspace contains previously defined variables:
    > x


    See Also
    --------
    currentWorkspace, deleteWorkspace, loadWorkspace, workspace, workspaces