Bug 20986: (follow-up) Avoid br tags, but allow for line breaks to be added easily...

Bug 20986: (follow-up) Avoid br tags, but allow for line breaks to be added easily with CSS

This patch removes the br tags from the XSLT in favor of some more
spans and classes.

This will allow to add the line breaks with one line of CSS:
span.holdings_note_data { display:block; }

Signed-off-by: Liz Rea <wizzyrea@gmail.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
(cherry picked from commit 65de22a6ef928bd6074e9a4d6a1e1351d0e1de9b)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>