DS-1823 move dspace.url to build.properties

dspace.url is now independent from baseUrl
add context to  two methods parameters  to have monthly statistics localised
Select the collection already selected in the previous operation
Update JSPUI/XMLUI robots.txt to include SiteMaps and update Ant build process to use fill it out.
First pass at a third-party plugins directory
Factor the loader out of PluginManager, and provide a minimal unit test.
Add test of loading from a JAR.
Correct loading from JAR.
Fixes DS-2113: JSPUI HTML5 upload should store Bitstreams...
DS-2138 Discovery should get user's special groups (i.e. IPAuth)
Export the repository's contents as RDF into the Semantic Web.

This commits adds a module dspace-rdf. The module will convert the
metadata stored in DSpace into RDF. The converted data will be provided
over a webinterface and a SPARQL endpoint.
rdfの文字化けを修正
Uses jena version 2.12.0 and removes workaround for bug JENA-663.
RDFConfiguration: added a method to load comma separated config values.
Enhanced and renamed the DSORelationsConverterPlugin into SimpleDSOR...

Renamed the DSORelationsConverterPlugin into
SimpleDSORelationsConverterPlugin.
Overhault the Plugin: it can be configured now and it can create
multiple links per DSO Relation.
Uses all possible identifiers to generate URIs.

This commit enables dspace-rdf to use all PersistentIdentifiers minted
by DSpace and not only handles. It makes advantage of the changes
introduced to DSpace by DS-1990. Persistent Identifers should and will
be used as fully functional http URIs only (e.g. a DOI will be used in
the form http://dx.doi.org/<doi> and not as doi:<doi>).
The DSpace Matadata Mapping vocabulary moved to digital-repositories.org
Repaired the build process after rebasing.

The dspace rdf war project wasn't build anymore as the activation of the
modules changed with the Mirage 2 contribution.
XOAI add bitstream description to xoai metadata format
Enhanced the dspace-rdf command line interface.

Added the RDFizer to the launcher.xml configuration.
Added a command --convert-all.
Prints help if no options were given instead of starting reconvertion of
all content (which may take a lot of time).