Lots of squisher work.

Gave up on clever unicode-->ascii and just used encodeURI/decodeURI.
Let Lempel-Ziv worry about resmooshing it.
Moved from urlSquisher2 to just squisher.
new clickless eval3 squishing

eval3 now uses the new squisher automatically, with no "squishURL"
button needed. The base64 survives linkification much better than the
old squisher, too, so URLs are easier to send through HTML email etc.