adding a .LRN context bar that aids navigation on pages within applications mounted under classes and communities. TODO: provide the context bar also for application under the main dotlrn instance at /dotlrn (My Files, My Calendar etc.). This commit largely fixes bug 391.
fixing bug 370 - deletion of empty departments in dotlrn. The apm_package_instance_delete proc was misspelled. Making the delete_site_nodes_and_package proc delete the child nodes before parents.