Updated openmpi to 1.8.1
Fix slice display
Remove static Button bar memebers
Fix problem with multiple plots
Fix USG problems
Fix merge errors
Fix USG plots
Fix z scaling in USG
Fix vertical scaling
Fix zscaling init
Add xyt template
Expose xyt plots
remove diagnostics
remove diagnostics
remove diagnostics
Fix init camera
Fix fill_value exception
Implement timestepping via key press
Hook up volume & surface to animation events
Complete enabling of animation