GitLab

Removed casting to and from double data types when sending MPI data.

Updating of the render settings will now not happen until the render
button is pressed. This will allow the user to redefine the area an
infinite number of times until the render button is pushed.

The image height was incorrectly being multiplied by the number of
processes at image assembly. Since the network sending of data was
implemented the width given in the settings is the actual width and not
the divided one.