Also allow URL specification for a package. This works for things the
package may depend on, too.
Allow PKG_PATH to be used anywhere a package is being searched for.
out by Bruce.
2. Add a "feature" to pkg_create (OK, OK, it's a miserable hack!) to get
it to dump its internal packing list out so that the `fake-pkg' rule in
bsd.port.mk can generate a more meaningful packing list.
