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)
XOAI add bitstream description to xoai metadata format
Add sample configuration and document it
XMLUI My Archived Submissions to sort using DB rather than array loop
DS-2180 Fix findBySubmitterDateSorted to work in metadata4all
Fix to avoid connection pool exhaustion for slow downloads and big files
Put the Item's persistent identifiers into the DRI document.
Add Altmetric.com badging
fix display: declare the confman namespace used here
Rename module configuration to be a little less generic
Switch to direct use of dc.identifier.uri metadata