once doc is removed, check that doc permissions are correct
Currently docs are copied from pd/doc using
install -m644. This will change to
rsync -ax which retains the permissions of the source.
However, on Linux and (I think) Windows, the directory permissions are read only. So the user won't be able to accidentally revise the help patches.
However, I'm not sure about OSX app bundles.
Still, the "--perms" and "--chmod" options of
rsync look sufficiently over-engineered and confusing that I don't want to spend time fooling around with them. So if someone else wants to investigate that I would appreciate it.