Add a script to find audio close to that marked as interesting

At the moment, it only gets the rest of the file (minutes 2 to 15,
while the interesting audio was minute 1).

It would also be possible to look for the previous 15 minutes.
ignore doc-minutes for now
Big variable rename: morepork -> call

Because it won't just be used for moreporks. The weka detector can have
a weka.js that defines the same call functions as morepork.js.

Nothing seemed to break.
Fix some js2-mode warnings and reduce console noise
Change spectrogram polynomials again, and log maximum value

Maximum value is useful for working out what the polynomials should be.
So is http://graph.tk/
gitignore any .dbm file
set height of moving peice's canvas
missing a call shouldn't start audio playing