Revision 547973

Changing: DocumentBuilder.toDocument(SolrDocument) function so it does not unnecessarily make an extra Map and List and does not call functions for stuff it can easily do internally. 

This is not intended as a final implementation; it is better then the existing one, but still needs work.

http://www.nabble.com/Re%3A-svn-commit%3A-r547493---in--lucene-solr-trunk%3A-.--src-java-org-apache-solr-common--src-java-org-apache-solr-schema--src-java-org-apache-solr-update--src-test-org-apache-solr-common--tf3931539.html