first commit, not working yet
first working version, some saves
fixed oriented edges bug
fixed flipping a path
started button-based UI
README added
boundaries, show/hide
shaded rhombi
Added a bunch of examples
Controls for middle; save view parameters
Load/save buttons
Lengths data now saved.  Center graph edges not active.
resizable window, hiding and showing entire pieces, some layout
dimer width adjustable
fullscreen. upside-down, preliminary eps export to fixed filename
kludged in auto-displaying eps
highlighting now works properly
eps rightside up. bug fixes.  Data saving back on.
fixed highlighting and boundaries in center picture
few more bug fixes