The org.openmrs.order.RegimenSuggestion class should be removed. Also, remove any definitions of global properties or xml that references it.
This class was only used to power the Regimens portlet on the patient dashboard, and this was removed in OpenMRS 1.10, so the class should go away also.
Eventually this will be properly modeled with Order Sets.
(Ticket completely rephrased 07-Jan-2015.)