fix the --illustrate option so that it scales the hashes correctly

[db48x]

The hashes were not scaled to correctly overlay the spectrogram; they were squached and unreadable. I also changed it to display the hashes from the reference where the match was found in addition to the hashes from the query and those hashes that matched. There are also now checkboxes for turning each of these three on or off.

Fixes #65.