Fixed the time estimator in pronsole.py

at beginning of move set feedrate to average of last and current feedrate.  do move with that feedrate.
then set the feedrate to the current feedrate.
if it's just a feedrate change, then the feedrate will become the feedrate.
if there is no feedrate in current move, feedrate will be last feedrate
if there is a move and a new feedrate then the move will take however long the average feedrate would take.

estimation is a bit more optimistic than pessimistic.  however it seems to be a lot more accurate.

Added an Estimated Time Remaining of Total Time to the status bar.

for non-SD Printing. They get more and more accurate until the end.

Catch exception so that disconnection does not give a traceback

Small change to enable T0 and T1 commands.

French translations update

Experimental

Bugfix: gviz exception while printing

Remove alphabetic sort order of baud rate combobox

Remove ability to click on Z +/- 100. Fixes #86