jp (base, file): file command and progress fixes and adaptation to new API: - progress use new API, and signals to monitor progression and avoid use of progressGet before progress is actually started - progress behaviour on event is managed by callbacks which are Jp attributes - progress with unknown or 0 size don't show the progress bar - better handling of errors - CommandAnswering is update to manage actions instead of the deprecated askConfirmation - managed actions use callback easy to associate with an action type. - file command is updated to manage these changes and the recent changes in backend behaviour - verbosity is used to display more or less message when sending/receiving a file - destination path can be specified in file receive - file receive doesn't stop yet, still need some work in the backend