Bug 5651: Question marks break searches w/ICU

Bug 5651: Question marks break searches w/ICU

When a user is doing a simple keyword search, they should not be expected to
deal with the magical behavior of question marks in Zebra. This fix escapes
question marks, and reduces the number of false positives for identifying a
"simple keyword search."

Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
(cherry picked from commit ad206a73f867f6a184f64d41e4ccfa8e5bb0cd21)

Signed-off-by: Chris Nighswonger <chris.nighswonger@gmail.com>