Bug 6419: Add custom HTML areas to intranet home pages

Bug 6419: Add custom HTML areas to intranet home pages

This patch adds customisable HTML text areas to acqui/acqui-home.pl,
authorities/authorities-home.pl, cataloguing/addbooks.pl,
virtualshelves/shelves.pl, members/members-home.pl, pos/pay.pl and
serials/serials-home.pl pages

To test:

1) Apply patch
2) Run updatedatabase.pl
3) Add some html to the new prefs IntranetAcquisitionsHomeHTML,
   IntranetAuthoritiesHomeHTML, IntranetCatalogingHomeHTML,
   IntranetListsHomeHTML, IntranetPatronsHomeHTML, IntranetPOSHomeHTML
   and IntranetSerialsHomeHTML
4) View the Acquisition, Authorities, Cataloging, Lists, Patrons,
   Point of Sale, and Serials homepages and confirm that your changes
   show. Note that this should display in exactly the same way as it
   does in the already extant IntranetCirculationHomeHTML and
   IntranetReportsHomeHTML system preferences.

Signed-off-by: Brandon J <brandon.jimenez@inLibro.com>
Signed-off-by: Caroline Cyr La Rose <caroline.cyr-la-rose@inlibro.com>
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>