improving PanTool's handling of domain limits; it now no longer pans at all if the view range is completely outside of the domain_limits
improving PanTool's handling of domain limits; it now no longer pans at all if the view range is completely outside of the domain_limits

ContinuumIO/chaco,burnpanck/chaco,burnpanck/chaco,burnpanck/chaco,ContinuumIO/chaco,ContinuumIO/chaco,tommy-u/chaco,tommy-u/chaco,ContinuumIO/chaco,tommy-u/chaco