Added function check.barrier for determining if the straight-line path between two points crosses a barrier or not.
added function make.dist.weights.barrier.r. This function calculates distance weighted neighbour matrix, applying a distance penalty to sites with barrier objects between them.
updated NAMESPACE to add make.distance.weight.barrier and check.barrier
added make.dist.weights.barrier.r and check.barrier.r to Collate list of DESCRIPTION
fixed examples or make.dist.weights.barrier.r, also new doc files for check.barrier and make.dist.weights.barrier
added dependency to rgeos
fixed make.dist.weights.barrier example (use of T rather than TRUE) throughout.
autoupdated docs for make.dist.weights.barrier