Re-implement the Undo stack as a List; the old implementation was buggy
Re-implement the Undo stack as a List; the old implementation was buggy

TomDataworks/opensim,EriHoss/OpenSim_0.8.2.0_Dev_LibLSLCC,EriHoss/OpenSim_0.8.2.0_Dev_LibLSLCC,EriHoss/OpenSim_0.8.2.0_Dev_LibLSLCC,RavenB/opensim,EriHoss/OpenSim_0.8.2.0_Dev_LibLSLCC,TomDataworks/opensim,RavenB/opensim,EriHoss/OpenSim_0.8.2.0_Dev_LibLSLCC,TomDataworks/opensim,TomDataworks/opensim,RavenB/opensim,RavenB/opensim,TomDataworks/opensim,EriHoss/OpenSim_0.8.2.0_Dev_LibLSLCC,EriHoss/OpenSim_0.8.2.0_Dev_LibLSLCC,RavenB/opensim,TomDataworks/opensim,RavenB/opensim,TomDataworks/opensim,RavenB/opensim