removed functions that are not used by Aegean, functions that are duplicates of that provided by math/numpy. Cleaned up some doc strings.
Cleaned up some doc strings.
replaced within() with np.clip()
deprecated a function that was listed as soon to be deprecated
deprecated some functions that are duplicated within Aegean.
flood fill replaced with label, find_objects. Same islands are found, changes need to be made to characterisation stages.