simplified data tables

now you can just give data as a flat file and Distance will parse it out
for you.
bug that didn't correctly allocate region, obs, sample tables
bug in binning found by Colin Beale

was creating bin 1 as > cp[1] and <= cp[2] rather than >= cp[1] and <cp[2]
clarified manual on cutpoints/binning
commented out extra region simple table stuff for now