I_Bresenham is now corrected
Small corrections (Image.h & main.c)
Added a point structure and some functions to play with it
Now, we can draw some polygons <:o)
Small correction in function display_CB
Removed a useless commented code

An old implementation of Bresenham algorithm was lying there for no
reason. All commented out.

Signed-off-by: Celelibi <celelibi@gmail.com>