A notifier that outputs IU structures to TEDview
Even though TedViewNotifier is an IU-sink (i.e., not a real processor),
it is implemented as an IUModule, because IUModules already have the
necessary TEDview communication code available.
an abstract pentomino tile / puzzle piece / whatever
it can be drawn (this is to be implemented by derived classes),
selected, then moved around,
and be in a placed or unplaced state,
and a few more things
implementing classes (for now) are ImageTile (used in Greifarm),
and PentoTile (used in all things pentomino)
class to perform linear regression and mean calculation;
ideal for incrementally added data points. old data points
can be discarded automatically using setMaxLag()