Enhance handling of connection attempts when hitting the connection limit

Bug #529.

Conflicts:
	NEWS
	include/atalk/globals.h
	libatalk/dsi/dsi_getsess.c
Fix setuplog description
Fix error in ad_openat(), bug #532

Saving from Word to a folder that is a symlink to a folder on another filesystem
results in a crash of the afpd process and the save to fail. This happens only
if the option "follow symlinks" is enabled
Fix handling of large number of volumes

o ensure only a maximum of 255 volumes is returned
o ensure the reply with the volume list fits in a certain buffer
  size, testing with 10.8.4 saw the maximum size the client would
  accept to be ~4600 bytes

Fixes bug #527