change sharing rules for journals

[Cecilia Vela Gurovic]

We need to change the way we allow journals to be shared in pages:

Personal portfolio: Only allowed to use and see personal portfolios.

Institution portfolio: Only allowed to see and use the journals created in that institution but not any journals from another institution, even if you are admin there.

Site portfolio: Only see and use site journals.

Group portfolio: (Still respect general create+edit permissions set in group settings)
 member 1: Only see and use all group journals
  and
    member's 1 personal journals
 member 2: See group journals
  and
    member's 2 personal journals
  and
    if member 1 already put journals in the block, member 2 can see it and remove it but not add it again upon the next loading of the block config

[Mahara Bot (dev-mahara)]

Patch for "master" branch: https://reviews.mahara.org/7475

[Cecilia Vela Gurovic (ceciliavg)]

related to bug 1666099

[Mahara Bot (dev-mahara)]

Reviewed: https://reviews.mahara.org/7475
Committed: https://git.mahara.org/mahara/mahara/commit/d5c30d0a718f7ac459f3ce525ca65dc0e0e30fd8
Submitter: Robert Lyon (<email address hidden>)
Branch: master

commit d5c30d0a718f7ac459f3ce525ca65dc0e0e30fd8
Author: Cecilia Vela Gurovic <email address hidden>
Date: Mon Feb 20 15:56:45 2017 +1300

Bug 1665481: Restrictions when adding journals in pages

behatnotneeded

Change-Id: I202828d9fb16ef9c9c0057ad2f03845683e31551