Land b_release_1_4_3 onto HEAD (20050619_0305)

b=6411 : enable rate-limiting of console error messages, and some console
         errors now go only to the kernel log.  Use CERROR/CWARN where
	 appropriate to allow rate-limiting of these messages.
b=1693 : add /proc/sys/portals/catastrophe entry which will report if
         that node has previously LBUGged.