Ou selector: active unit is now included in the unit's list.
Assign forwarding to dossier: reset issuer to current inbox.

When assigning a forwarding to a dossier, which concerning multiple org_units but only one adminunit,
the issuer has to be reset to current inbox in the successor task.
Accept task: Set default for newdossier`s title only for tasks.

For forwardings the default is only `Inbox`, which does not make sense at all.
Enabled Drag 'n' drop upload for tasks.
Merge pull request #339 from 4teamwork/pg_enable_dnd_upload_for_tasks

Enabled Drag 'n' drop upload for tasks.
Merge pull request #321 from 4teamwork/pg_assign_forwarding_fixes

Assign forwarding to dossier fixes
Task Transitioncontroller: update check's for multiclient wizards.

The wizard for `multiclients` tasks, are now only necessary when the task
are AdminUnit-comprehensive. OrgUnit-comprehensive tasks don't need wizard
and successor predecessor copies.
Merge pull request #319 from 4teamwork/pg_guard_adjustments

Task Transitioncontroller: update check's for multiclient wizards.
Merge pull request #320 from 4teamwork/pg_ou_selector_active_unit

Ou selector: active unit is now included in the unit's list.
Use sql tasks in dossier task-overview.
Extract `OpengeverTab` to its own module.

To avoid circular imports.
Fix wrong upgrade id.
Fix upgrade version check.
Add containing_subdossier to task globalindex.
Use `GlobalTaskListingTab` to render dossier task lists.
Add plone.api to the dependencies.
Also add a text column to `globalindex.Task`.
Remove useless mocktestcase.
Refactor task-overview, use SQL objects when possible.