Adding Salesforce map cloning support for webform types.

This addresses ticket #735: Salesforce Map Not Cloning on Non-Donation Forms. It implements hook_node_insert in for Salesforce genmap and checks to see if the node is being cloned. If it is an additional check is done to see if the node is a webform type and that it is mapped. If it is mapped the map is copied to the newly cloned node.