0.1.1; fix examples pointer
0.1.1
Steps toward sums.
first pass at moving Pins into (:>) and supporting sums.
Move Pins into the category. Eliminated BoolT. Added early sum support.
moved some example code from Circuit to Examples
more on sums
Generalized genSource; finished sum handling (untested).
tidy
Renamed `fst` & `snd` to `exl` & `exr`, and `lft` & `rht` to `inl` & `inr`