This change improves sequence analysis and subdissector interfaces, adds
payload Decode As support for DTN and IPN services, and add heuristic
dissection for BTSD.
Repeated words were found with:
egrep "(\b[a-zA-Z]+) +\1\b" . -Ir
and then manually reviewed.
Non-displayed strings (e.g., in comments)
were also corrected, to ease future review.