Internet Draft and as output produce a diff in one of several
formats:
- side-by-side html diff
- paged wdiff output in a text terminal
- a text file with changebars in the left margin
- a simple unified diff output
In all cases, internet-draft headers and footers are stripped before
generating the diff, to produce a cleaner diff.
PR: ports/73836
Submitted by: Lars Eggert <lars.eggert@gmx.net>
