add TT helper to squeeze strings into the UNOB straitjacket

add TT helper to squeeze strings into the UNOB straitjacket

The force_jedi_unob helper strips non-ASCII characters from
template output but does so nicely by converting the string
to NFD first.  This is meant to be used by EDI templates, although
could be useful for A/T output that goes to receipt
printers that cannot print diacritics.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>
git-svn-id: svn://svn.open-ils.org/ILS/branches/rel_2_0@18599 dcc99617-32d9-48b4-a31d-7c20da2025e4