Takes the transect data and works out how many blocks of a given size (in segment terms) fit into each.
block.info.per.su(block.size, data, name.su)a data.frame with the following columns
name the sample unit name (e.g. transect label)
num.seg number of segments in that transect
num.block number of blocks available
start.block block number for first block
end.block block number for last block
num.req number of blocks needed for the unit
number of segments per block
data used to build the model
names of the sampling units (i.e., transects)