Frame modification.

addbad	adds new bad pixels to a bad pixel frame
badgen	generates bad pixel frames
bcrop	crops Ultracam frames accounting for binning problem
boxavg	averages an Ultracam frame in boxes
boxmed	medians an Ultracam frame in boxes
collapse	collapses Ultracam frames
crop	crops Ultracam frames
expand	expands Ultracam frames
shifter	shifts and combines data frames allowing selection of good frames
window	windows Ultracam frames
wjoin	joins all windows into 1 large one