New version

For group comparison:

1. Added "add all (A)" button to add all images from the current page to the list.
2. Scaled button width to display better on windows

For pair comparisons:

1. Added "End cluster (E)" button to jump to the end of the cluster and mark everything "no match"
2. Changed image display positions. Now the two coins will be displayed close together.

General:

1. Added pyw file for opening by double click on Windows.