Delete useless README
Add some patterns to ignored files
Add CMake files to configure project
Do not hardcode paths to a sample image
Fix Qt inclusions
Various fixes in code to link against Qwt 6.1.1
FIx some C++ errors

Clang compiler was used to find more errors than displayed by GCC:
- Default params have to be declared in declaration of a method, not its definition
- fclose can't be called on a NULL FILE* variable

Declaration of CumulatedHistogram was also wrong: base class was declared with double template type
Simplify UtilityService class

It is not necessary to store a pointer to the current GenericInterface
Instead, we keep pointer to its WindowService
Various cosmetic fixes

- Remove useless ; at the end of methods definitions
- Indentation
- Shorten lines lengths
- Unused variable removed
[StandardImageWindow] Doesn't need to store a specific 8bits image

Instead, we can use the one (_displayImg) defined in ImageWindow base
class
Move histogram generation methods to the base class

Previously defined in StandardImageWindow, we defines it in ImageWindow
This will allows to display an histogram from a DoubleImageWindow
Reindent lines before modifying GenericHistogramView
[GenericHistogramView] Uncouple initialization and population of an image
[GenericHistogramView] Remove populate() method

The population of the plot is done directly in the right constructor,
this allows to initialize the view from an ImageDouble
Add missing constructors to HistogramView and HistogramWindow
Ensure DoublImage instance will initialize the right HistogramWindow
Add an assert when Histogram is initialized from double values
[GenericHistogramView] Fix initial setCkeced() states in legend
Allows to generate histogram from an ImageDouble
fixup cosmetic