CnCControl: support moving Z from the outside
Align: added two resettable work levels, one for camera and one for the tool
Widgets.level_store_widget: Moved from Align
CncControl: moved work/camera level stores here
Cnc: pick up line numbers from TinyG status messages
Align: upload now shows progress bar
Use new version of OCamlGcode (linenumbers)
Cnc: removed automatic line number generation; let the user do it
Align: show line number during uploading