BUG : elevation data is not correct in output stat using GeneratRPCSEnsorModel application Mantis Ref #881

Change ListView Parameter to use GetParameterStringList instead of GetParameterString.
when loading values from XML file. Also parameter active flag is not set.

 All this stuff have been moved into Monteverdi
 To achieve this goal, I removed:
 - Utilities/FLTK
 - Code/Gui
 - Code/Visu (old visualization framework)
 - Code/Visualization
 - and their relative tests and examples
Some modifications have been also done into some CMakelists.txt to remove all links to visualization

BUG: Remove old Modules/Numerics/Optimizersv4/src folder from internal ITK, already removed from ITK 4.5.0 trunk

ENH: Replace use of IsADirName and IsAFileName methods of otbSystem.h by similar ones of itksys/SystemTools.hxx

ENH: Added GetInput() methods to QtWidgetFooParameter classes; Set non-initializerd pointers to NULL on constructor header.

ENH: Replace use of SetToLower and SetToUpper methods of otbSystem.h by similar ones of itksys/SystemTools.hxx

ENH: Replace use of GetPathName, GetShortFileName and GetExtension methods of otbSystem.h by similar ones of itksys/SystemTools.hxx