Bug 17047: subscriptions management with Mana-KB

Bug 17047: subscriptions management with Mana-KB

- add a class SharedContent.pm to communicate with Mana-KB server
- add a link in serials-menu.inc to serials_search.pl to open
a mana-subscription research form
- modify the research form in serials-search.tt to show the right fields
for Mana-KB
- create datatable in mana-subscription-search-result.inc to show
results from a research on Mana-KB
- modify serials-search.pl to manage research on Mana-KB

- add a mana_id to subscription table
- add a share button on serials-toolbar.inc and a modal to ask
the language of the share and to alert if the subscription is
already link to a Mana-KB subscription model
- add function in C4/Serials to get all the info for a subscription
sharing
- modify subscription-detail.pl to manage sharing to Mana-KB

- modify subscription-add.tt and subscription.pl to manage a
import from Mana-KB during a subscription creation
- add 2 script in svc for ajax calling from subscription-add.tt
to communicate with Mana-KB server during a asubscription creation
- add a function in Subscription.pm to have all the info for a Mana-KB research
from a biblionumber
- modify functions used by subscription-add.pl in C4/Serials to manage a
frequency which came from Mana-KB server and not already created on the
koha database, and modify the tests of the said functions

Signed-off-by: Brendan A Gallagher <brendan@bywatersolutions.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Rebased-by: Alex Arnaud <alex.arnaud@biblibre.com> (2018-07-04)
Signed-off-by: Michal Denar <black23@gmail.com>
Signed-off-by: Michal Denar <black23@gmail.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>