Revert "Added instructions to be displayed upon running.  Now allows user to press any key at any time to load a new image.  Problem still exists if you click the maximize screen button in top right of box; causes the next image selected to not load correctly."

This reverts commit 82b4c9f16661d4123cb5a07e93109d2fdbbb02c0.
Revert "Revert "Added instructions to be displayed upon running.  Now allows user to press any key at any time to load a new image.  Problem still exists if you click the maximize screen button in top right of box; causes the next image selected to not load correctly.""

This reverts commit 23bfcc278ab4a9244e7e6e2d714f8db7e9a9b6c3.
Updated circle finding algorithm to have an even tighter fit, and much
more closely calculates the center of the area.  Added comments to make
code more readable.