"PROTOABBREV A name for the protocol for use in filter expressions;
it should contain only lower-case letters, digits, and
hyphens."
In proto_register_protocol(), generate a warning if PROTOABBREV contains
invalid characters. Along with the list above, allow underscores and
periods. Fix up whitespace.
Lower-case PROTOABBREV in several dissectors.
svn path=/trunk/; revision=13967