incoming chmod on daemon fails on subdirectories

[Matt McCutchen]

The trouble is that tweak_mode (the function that applies chmod
strings) determines the type of the file it is processing based on the
type bits of the original mode it is passed, but dest_mode calls it
with a mode in which the type bits are zero when calculating
destination permissions for a file that doesn't exist yet.  I am
working on a patch.

Matt