Bug 21772: Add holds and account information to SCO

Bug 21772: Add holds and account information to SCO

This patch introduces holds and account information to the SCO page. It
uses the introduced include files that are also used in OPAC
(opac-user.pl and opac-account.pl).

To test:
1) Have a patron that has holds and account lines
2) Enable the SCO module
3) Use the patron's cardnumber to get to its details
=> SUCCESS: New tabs are presented, and they display holds and account
information as expected
4) Sign off :-D

Sponsored-by: City of Portsmouth Public Library
Signed-off-by: Sarah Cornell <sbcornell@cityofportsmouth.com>
Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>