Bug 10727: Replace carriage return with <br /> when printing hold notices

Bug 10727: Replace carriage return with <br /> when printing hold notices

This patch replaces carriage return with <br /> in the content of
hold notices for printing. This is necessary to convert html file
into well formatted pdf file.

Test plan :
  - check in an item reserved by a borrower
    that has not activated email notification
  - verify in message_queue table that you've got a
    new HOLD_PRINT notice with status 'pending'
  - run gather_print_notices.pl <directory>

Without the patch, the script generates a html file without <br /> tags.
If you run printoverdues.sh <directory>, the text in the resulting PDF
file is all on one line

With the patch, the script generates a html file with <br/> tags and
the PDF file created by printoverdues.sh is well formatted.

Signed-off-by: Srdjan <srdjan@catalyst.net.nz>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>