reduce doublecontent check document (prevent out of memory)

see http://mantis.tokeek.de/view.php?id=437

test result (concurrency=7)
2000 docs = eom always
1000 docs = eom always
100 docs = eom never

chosen -> 200 docs (eom not encountered during test with 1GB mem setting)

source/net/yacy/search/schema/CollectionConfiguration.java

@@ -1420,7 +1420,7 @@ public class CollectionConfiguration extends SchemaConfiguration implements Seri
         String query = con.toString();
         SolrDocumentList docsAkk;
         try {
-             docsAkk = segment.fulltext().getDefaultConnector().getDocumentListByQuery(query, null, 0, 2000,
+             docsAkk = segment.fulltext().getDefaultConnector().getDocumentListByQuery(query, null, 0, 200,
                      CollectionSchema.id.getSolrFieldName(), CollectionSchema.exact_signature_l.getSolrFieldName(), CollectionSchema.fuzzy_signature_l.getSolrFieldName());
         } catch (final IOException e) {
             ConcurrentLog.logException(e);