Possible future app improvements

[fmaussion]

• display of uncertainties into the graphic
• possibility to choose between absolute and percentage change of volume
• adding a map in which the user can select glaciers
• implement tick-boxes for choosing the displayed RCP-scenarios
• two dropdown menus to give the opportunity that every region can be compared to every other region/country

If you are interested to contribute you can send us the edited
file <https://github.com/OGGM/alps_future/blob/master/app.ipynb>_ per mail or
with a pull-request. Thanks!