Simple search added, searching in the first letter of surnames.
Added commentary inside Search.pm for explanations
C<$env> is ignored.
-BUGFIX 499: C<$type> is now used to determine
+BUGFIX 499: C<$type> is now used to determine type of search.
+if $type is "simple", search is performed on the first letter of the
+surname only.
C<$searchstring> is a space-separated list of search terms. Each term
must match the beginning a borrower's surname, first name, or other