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

add check for empty dict (or None) in recursive_change_key_to_float, as for some reason this was failing. In this case, return an empty dict.

(oops)

couple of other typo fixes