BUG 9180 Correct Solr update and counters implementation

The following changes were made:
- fix update Solr index process
- implement casesenuLoader using Solr server to display counters
- fix cron missing reference to system class
- add function and classes documentation

workflow/engine/classes/class.searchIndex.php

@@ -1,8 +1,12 @@
 <?php
 
-//$indexFields = array();
-
 
+/**
+ * Class used as interface to have access to the search index services
+ * 
+ * @author Herbert Saal Gutierrez
+ *
+ */
 Class BpmnEngine_Services_SearchIndex
 {
     private $solrIsEnabled  = false;