XXXX: avoid appending xxxx multiple times to frame.protocols field

[Guy Harris <guy () alum mit edu>]

A given frame's dissection can have multiple packets for a given protocol, if, at any protocol layer, a PDU can contain 
multiple PDUs for the next layer above it (or parts of multiple PDUs, as with byte-stream protocols such as TCP).

Some recent changes have been submitted to fix that for particular protocols.

However, the underlying problem is that frame.protocols is intended to be a set (in which a given item can occur only 
once) rather than a bag (in which a given item can occur multiple times).  Perhaps it should be implemented as a set, 
with uniqueness enforced, so that individual dissectors don't need to keep from putting another XXXX in the bag if 
there's already one there?
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