Request for Changes-75: Monteverdi/App November code sprint

This RFC aims to integrate "small and easy" improvements in OTB/OTB app and Monteverdi related to users feedback and taken from the OTB wishlist:

List of wishlist items integrated:

Improve "Mean Shift Smoothing (step1): [3]
Button for restore default value for gamma and alpha value
Improve parameter description and documentation in OTB GUI (add short key as tooltip, improve documentation in the doc tab)
Fix in BandMath documentation
Button to reset all shaders to normal.
Handle missing file extensions in otbgui (currently a cryptic error message) : the application will try ".tif" extension if the output filename doesn't have one and if OTB is unable to write current output filename.
Show total processing time on completion in otbgui (otbcli has the 'time' command of course). Note that the execution time is measured by the otb::Wrapper::Application class, so this time can be retrieved on any launcher.
otbgui: add visual confirmation that processing has been completed (if it's very fast for example). At the end of a successful processing, there is a status 'Done' displayed for about 1 second.

Other small improvements made in GUI applications:

The small progress bar at the bottom doesn't pop in/out when executing the application

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