function bursts = findBursts( spiketrain, assigned, maxInterspikeDiff, maxTotalDiff, minSpikes)
DESCRIPTION
finds bursts in a spiketrain of minimum minSpikes length, each separated
by <= maxInterspikeDiff ms and not longer than maxTotalDiff in total.
assigned: assignments for each spike (neruon #)
ueli rutishauser, urut@caltech.edu, jan04
