ENH: BetterZoom history works, added public methods for zooming in just x or y direction
ENH: BetterZoom history works, added public methods for zooming in just x or y direction

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