Bug 11310: update the XSLT for the Bootstrap theme

Bug 11310: update the XSLT for the Bootstrap theme

When the Bootstrap theme was started, the XSLT directory
was copied over from the prog theme.  However, it was not
kept up to date with respect to changes to prog's XSLT.

This patch rectifies the problem by copying over the
current state of prog/en/xslt to bootstrap/en/xslt.  As
a consequence, the following bugs or enhancements should
now be reflected in the Bootstrap theme:

* 6886
* 10905
* 10465
* 10564
* 10793
* 10218
* 6594
* 9820
* 10745
* 6553
* 10218
* 10284

To test:

[1] Apply the patch and ensure that OPACXSLTDetailsDisplay
    and OPACXSLTResultsDisplay are set to 'default' and that
    OPAC theme is set to 'bootstrap'.
[2] Ensure that OPAC results and bib details look OK.
[3] To be really thorough, run through the test plans for the
    other bugs referenced by this patch.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>
Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>