Gerald Combs authored Nov 18, 2020 and AndersBroman committed Nov 30, 2020

Convert wiretap/ascend.y.in from Bison/YACC to Lemon and rename it to
wiretap/ascend_parser.lemon. Tighten up some of our scanning and
parsing. Make the indentation in it and related files consistent. Aside
from the recent IPv4 fragment offset changes, this produces identical
output to the 3.4 branch for the Ascend trace files I have here.

Remove the comment about supporting other commands. Another timeline
might have an Ascend that successfully pivoted to DSL or 15625B+1D
gigabit ISDN, but this one has neither.

This was our last/only Bison/YACC file, so remove Bison/YACC as a
development and packaging dependency and remove references to it from
the documentation.