Bug 5652: display subtitles on patron checkout and holds summary

This patch adds subtitles (from Keyword to MARC mapping) to the
following tables on the checkout page:

- Checkouts
- Previous checkouts
- Relative's checkouts
- Relative's previous checkouts
- Holds

Additionally it suppresses the appearence of the superfluous word "by"
in cases where the biblio has no author.

Test scenario:
--------------
1)
Make sure that you have one or more fields mapped to subtitle in:
Home . Administration . Keyword to MARC mapping
(e.g. 245 b)

2)
Test the checkout page with patrons having
- current checkouts (today)
- previous checkouts
- relatives (e.g. kids) with current /previous checkouts
- holds on items
- holds on biblios

...with items having:
- title, subtitle, author
- title,  no subtitle, author
- title,  subtitle, no author
- title, no subtitle, no author

3)
Do the same on patron's detail page

Signed-off-by: Nicole C. Engard <nengard@bywatersolutions.com>
All tests pass

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>
Bug 5652: (follow-up) include subtitle in hyperlink

This follow-up patch makes the subtitle part of the same
hyperlink as the title, maintaining consistency with other
pages in the staff interface such as list contents.

To test:

[1] Make sure that the Keyword to MARC mapping includes
    mappings to 'subtitle'.
[2] Find a biblio that has both title and subtitle.  Check
    it out to one patron and place it on hold for another.
[3] In the checkout and patron details pages, verify that
    the entry for this bib in the list of checked out titles
    or hold requests includes both title and subtitle in
    the same hyperlink.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>