Bug 8911: make sure history.txt gets installed where history.txt can see it

Bug 8911: make sure history.txt gets installed where history.txt can see it

This patch makes Makefile.PL put the history.txt file in the right places
depending on the chosen setup layout, adds a reference to that place in
koha-conf.xml (and debian template version), and finally tweaks about.pl to
use it.

To test, apply the patch and verify that perl Makefile.PL runs fine, and
installing in
 - dev
 - single
 - standard
layouts works as expected. Then go to the about.pl page and see if Koha's
history shows there.

Then, build your packages and test on your newly created instances.

Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>