(cherry picked from commit a8db8b4c)

Superbuild triggers an error on Linux with a local swig.

Patch provided by Emmanuelle Sarrazin

This reverts commit 2c534ee8.

Revert "Revert "ENH: Mantis-1355 : Apply patch to set OTB_APPLICATION_PATH environment..."" this fix was fine

This reverts commit 562ddd8d.

The fix consists of:
- Quicklook and Histogram widgets:
    * More flexible min/max sizes
- Color Setup Widget
    * Remove uninformative label to save vertical space
    * Change size policy to Minimum
    * Add 9px margin for look and feel

Revert "ENH: Mantis-1355 : Apply patch to set OTB_APPLICATION_PATH environment variable in monteverdi desktop file"

This reverts commit cb38ea6f.

Revert "BUG: prevent tinyxml header to define DEBUG on windows, conflict with itk::LoggerBase::DEBUG"

This reverts commit 507c6dc2.

This reverts commit f618e6c6.

(does not actually fix the issue.)

ENH: Mantis-1355 : Apply patch to set OTB_APPLICATION_PATH environment variable in monteverdi desktop file

Put DEM clear and loading in DoUpdate().
This change correct a side effect that was present in DoExecute() function.