DragonFlyBSD

Using the following test:
setenv LC_ALL de_CH.ISO8859-15
foreach i ( `jot 178 178 356` )
echo a | tr 'a' "\$i" | cat -v
end

output will contain some printable characters listed instead with a question mark.

removing the !isprint() check for vflag results in printable characters being displayed correctly again. Making the behaviour of cat -v consistent whether locale is set to C (default) or another.

Attached patch removes the !isprint() check and switches from just setting locale settings set in LC_CTYPE to LC_ALL to import all set locale variables.