cdif: remove --visible-cr and --visible-esc, deprecated since 4.18.2 in favour of --visible cr=1 and --visible esc=1
cdif: document --rcs, -r<rev> and -q again; they still work
sdif: make --help print the same way as cdif and watchdiff
watchdiff: document all the options. Only two of twenty were described; the rest had nothing but the SYNOPSIS summary
watchdiff: say what the command does at the head of DESCRIPTION
cdif: add the MODULE OPTIONS section, which sdif already had
sdif: add the GIT section, and the LESS/LESSANSIENDCHARS advice to ENVIRONMENT
App::sdif: make GIT a section of its own, not a part of INSTALL
Line up the section order of the three manuals
Go through the manuals fixing what was hard to read or plainly wrong: a misspelled color name (honeydue for honeydew), "locate" for "locale", plain text and a command name marked up as links to Perl modules, and a number of passages that said the opposite of what was meant