First version of NicCLIM demo

Well, I consider the first version of NicCLIM done. Everything to-add is big enough that it warrants a later version.

The demo useage blogpost shows how powerful the creating, extracting, clobbering rectangles, and VI-like fine-detailing useage is, and gives both the high level (hotkey taps) and extremely low level (sending commands programmatically matching those) useages.

The programmability shows the next version feature - an integrated, loosely VI-like macro system is going to be powerful.