Added the ability to change e the name of a group. There is notable caution when doing this. If a group is referenced by another group and its name is changed, the reference will be lost.  One must go through and change all the references manually.  However, to make this a little less of a headache, there is now a shortcut for locally referenced parameters.  If a parameter is to be referenced within the same group, the group name is omitted and the 'dot' is still placed before the parameter name.