Added possibility to acquire I(time) - fix energy curves.

This is enabled through a checkbox in Set Parameters.
The tracking windows do not move, and do not rescale.

Signed-off-by: Nicola Ferralis <feranick@hotmail.com>
Updated Changelog and Todo

Now the todo refers to the issue tracker in
https://github.com/feranick/easyleed/issues

Signed-off-by: Nicola Ferralis <feranick@hotmail.com>
Labels adjust automatically when using I(time).

Signed-off-by: Nicola Ferralis <feranick@hotmail.com>