Fix bug: Make a note of what *to and *from we're using

* src/leafscan/leafscanimg.m: Each time we change CC we make a note of
y{from,to} and x{from,to}. We use these to add to circle center values.
Create a comma separated file (|->,)

* src/leafscan/leafscandir.m(leafscandir): Replace '|' with a comma (,).
Show what we calculate on top of img.

* src/leafscan/showleafscanimg.m: Use rectangle to draw a circle on top of the
image. This is to make sure the algorithm is calculating everything correctly.