install.sh now uses "-y" to skip questions about uninstall

ensemble.py's load_ensemble() now has a 'quiet' options to stop the spinner being shown on the command line : useful when this is run in a script

grid.py's Xinit removal code has been cleaned up into a try/except instead of a load of nested checks on the dict

playing with the installation scripts to actually remove the installed binarycpython version and then install a new one