Bug 9683: Allow disable rewrite apache mod

Bug 9683: Allow disable rewrite apache mod

In Apache config koha-httpd.conf, URL-rewriting is enabled and does not
allow to disable mod_rewrite. Also, first rewriting rule
"RewriteRule (.+) $1?%1%2 [N,R,NE]" is enabled by default. This rule
rewrites nearly every URL. I propose to comment it in sources so that is
must be intentionally enabled.

This patch sets rewriting options into a conditional tag.

Test plan :
Test OPAC and intranet with and without mod_rewrite activated.

Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>
Signed-off-by: Mason James <mtj@kohaaloha.com>
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>
The new Apache configuration seems to work fine (or at least as "fine"
as Apache gets) both with and without mod_rewrite enabled.