Isolate escape sequences permitted in copy-mode
Isolate escape sequences permitted in copy-mode

Correction to d499d75: backslashes and newlines are NOT the only escapes
permitted within transparent throughput. More accurately, such lines are
read in what the Troff manual calls "copy mode" (§7.2). String and macro
definitions are also parsed using this mode, so they should be reachable
by other rulesets.

Alhadis/language-roff,Alhadis/language-roff