New in 0.22 (12-4-2005):
Added neutrons to “gun type” list, change “atoms” to “He atoms”, added custom atoms.
Moved Double-Slit checkbox into the play area, and off the control panel.
The “slit absorption” checkbox, the slit control sliders, and the detector controls, are all be invisible if the double slit is unchecked.
Wave area size is computed based on all controls (to ensure everything fits).
“One-shot” is now one-shot per particle.  Once the particle is detected at the screen, the detector is automatically enabled again.
The “slit absorption” checkbox has been moved to the double slit control area.
Fixed Bug: sometimes when I press “remove all” button, barriers becomes translucent but don’t go away.
Barriers & Detectors appear at random locations (rather than all on top of each other at the same place).
Default slits are wider, so in the default setup, lots more wave reaches the detector.
Fixed Bug: the combo box was mistakenly shown in the Mandel panel.
In two lasers, there are two guns, one the same as in the previous panels, one different.
For electrons and atoms, gun is higher so that particles appear to come from inside the gun, not above it.
When “one-shot” is unchecked, all the disabled detectors are automatically enabled.
One-Shot detection is now disable by default.
Removed the swoop-style wiggle me.
Gray component backgrounds are now light green.
	<Change background color from gray to something more fun (blue background is better, but there’s still too much gray).>
bugfix: ·Application crashes on startup when different region is specified (due to “0,00” parse error.)
The default screen display on high intensity mode is “Average Intensity” not “hits.”
Put “Double slit” checkbox on control panel.
Double slit controls appear near slit if it is enabled.
Bugfix: Double slit detectors should be hidden when barrier is hidden.
Changing slit width no longer changes separation between centers of slits.
Added a corner to barriers and detectors, changed the mouse to double-head arrow.
	<Instead of yellow box to change size of barrier or detector, a small diagonal arrow should appear in the corner, like the arrow that appears to resize things in windows.>