Implement the XML export connector

* finish the implementation of the Livelink connector using
  the XML Export to get node information
* detect and uudecode LLCookie automatically if entered uuencoded
* ensure permissions in the node data returned by the REST API
* add option to specify the atarting (root) node
* make the LAPI connector dummy for the time being
* Print stack traces in case of error
* bump version to 0.1.0