Added minocc, maxocc, minframes args to lsrecvis
Added 4th plot showing occupancy to plothypo, added occupancy.m to plot just that.

Also added axes labels.
Removed yellow circles from one plot.
Mods to replay:  added reanalyze, nreplay options, only pause if not running realtime
Added newline to printf
Fixed bug in voronoi -- was giving 0 duration samples
Added serialpoll.m