Bug 13819: Add biblioitems to ISSUESLIP and ISSUEQSLIP in C4::Members::IssueSlip()

Bug 13819: Add biblioitems to ISSUESLIP and ISSUEQSLIP in C4::Members::IssueSlip()

Document all expansions within  C4::Members::IssueSlip()

http://bugs.koha-community.org/show_bug.cgi?id=13819

Signed-off-by: Frederic Demians <f.demians@tamil.fr>
  - Works as described. ISBN appears on ISSUESLIP & ISSUEQSLIP.

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
  - Not all fields for biblioitems are available, but neither
    are they all available for other tables. Noted in POD.

Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>