waitbar with ETA, Estimated Time of Arrival...
Fraction: is a number between 0 and 1. a value of 1 means completed and closes the window.
h: window handle.
some nice features:
* Estimates how much time before completion.
* Automatically open and close the waitbar window.
- It closes the window when fraction reaches 1
* You can abort the program by closing the progressbar
fixed bugs, changed appearance