Python's distutil's copy tree code maintains a cache of directories
created so deleting a tree a different way then coping the same
tree results in an error because the destination folders in the
tree are not present because distutils thinks they exist. The
solution is to implement a copy tree function.
Added a check in the options post processing to check is the
prefix path allows writes. No actual write check is made. just
the permissions are checked. If the --no-install options is
used the check is not made.
Moved the --no-install option from the set builder to the options
module.
