typing ^V to a shell

[Paul Fox]

i noticed a while ago that it was impossible to type a TAB
character on the ash commandline.  by comparison, gnu readline
allows prefixing any character with ^V to force insertion of the
character -- this is now i normally enter a TAB when using bash. 
there was code in lineedit.c to allow this, but it was ifdefed
out along with unrelated features.  i've re-enabled it
(unconditionally).  along with the fix for 8-bit characters, i
think it's now possible to enter any character (with the possible
exception of NULL) at the commandline.

please holler if there's a problem.

paul
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 paul fox, pgf at brightstareng.com