Bug 14716: URI-encode URLs in UNIMARC xsl templates.

Bug 14716: URI-encode URLs in UNIMARC xsl templates.

https://bugs.koha-community.org/show_bug.cgi?id=14716

Test plan:

1. Catalog a record with series name "Series & more"
2. Find the record
3. Make sure clicking the "Series & more" link works and the ampersand is properly encoded in the URL.
4. Also try the attached test records and make sure their links work.

Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>