examples: add book-based executor that is close to break even against SCO,SCM,SCS
gui: fix crash when started before me and no move has been made
examples: add MeTooMarketMaker that just joins inside
notes: add notes on openings from massive icofy file; update TODO list
pnl: update to allow it to run under watch, and to produce a png
examples: fix broken logic to add missing qty at a level
gui: strip out pnl to enable it to keep up
gui: sticky ladder center
me: add basic checks on qty and num orders (no max position yet)
me: add position checks