Bug 9961: Add truncation support to QP driver

The original implementation of QueryParser did not handle truncation
based on the QueryAutoTruncate system preference. This patch adds support.

To test:
1) Apply patch.
2) Turn on UseQueryParser.
3) Set QueryAutoTruncate to "automatically."
4) Search for "har". Note that it returns results with words
   like "Harry" (i.e. with right truncation).
5) Search for "har*". Note that it still returns results with right
   truncation.
6) Set QueryAutoTruncate to "only when * is added."
7) Search for "har". Note that it returns only records that have the
   exact word "har" in them (most likely there will be none unless you
   have Hebrew items).
8) Search for "har*". Note that once again it returns results for "Harry"
   (i.e. right truncated results).
9) Sign off.

This patch also reindents a hash in Koha/QueryParser/Driver/PQF.pm
because it was hard to read before.