BUG 0000 Change Solr configuration environment variables

Now the Solr configuration variables are read from the env.ini file that
is stored in the shared//sites/SYS_SYS/ folder.

The system class is used to get the environment variables using the
solrenv function.

workflow/engine/classes/entities/Base.php

@@ -40,7 +40,7 @@ class Entity_Base {
   protected function validateRequiredFields($requiredFields = array()) {
     foreach ( $requiredFields as $k => $field ) {
       if ($this->{$field} === NULL) {
-        throw (new Zend_Exception ( "Field $field is required in " . get_class ( $this ) ));
+        throw (new Exception ( "Field $field is required in " . get_class ( $this ) ));
         die ();
       }
     }