Fix issue #117 -- use \b when searching for a hyphenated word
Normally double-clicking a word in the list does a non-regex
search with Whole Word checked. However when a hyphen appears
the search is a regex with [\-\s]* replacing the hyphen, in
order to catch all the "candidate" versions of the phrase.
However QRegExp does not support "whole word" expecting the
use of \b word boundary metachars instead.