first attempts to display non-scaled image
variables names changed, now all are either H for Height of W for Width
display at real size of an area works
bit of code cleanout and -zoom option added when -rs
problem about non real size image display solved. the size of Cov3_f had been changed to use the struct borders b, but i had forgotten to decimate the size in case it was necessary
up and down arrow keys implemented, only fails when reaching the bottom
all arrows implemented and working, and problems when reaching image borders solved. loading of new images a bit slow due to the assign() function
arrows and mouse events WORKING and no problem when reaching end of image and/or when image smaller than screen
cleaning out things