Remove more "CHECK_DISPLAY_AS_DATA()" calls and "pinfo->current_proto ="

Remove more "CHECK_DISPLAY_AS_DATA()" calls and "pinfo->current_proto ="
statements.

Move the setting of the Protocol column in the Appletalk ARP and IPX
dissectors before anything is fetched from the packet, and also clear
the Info column at that point in those and some other dissectors, so
that if an exception is thrown, the columns don't reflect the previous
protocol.

Fix the registration of the IPX RIP dissector to use the right protocol
ID.

git-svn-id: http://anonsvn.wireshark.org/wireshark/trunk@2928 f5534014-38df-0310-8fa8-9805f1628bb7