Remove portal_interface when upgrading to Plone 5
add bbb alias for InterfaceTool
Merge remote-tracking branch 'origin/plip-13770-portal-tools-removal'
install plone.app.event and remove portal_calendar when upgrading to plone 5
overwrite first_weekday even if it's already set, because it will have been set when plone.app.event is installed
While migrating to Plone 4.3, the Default Plone Password Policy is not added???  This step adds it if necessary...
fix existing portal_factory instances
fix existing portal_metadata instances
Compatibility code
Merge pull request #13 from plone/plip-13770-portal-tools-removal

PLIP 13770 bbb
fix broken import after Plone 5
fixing IFactoryTool import
avoid strange circular import problem
Merge pull request #12 from gbastien/master

While migrating to Plone 4.3, the Default Plone Password Policy is not added???
Merge branch 'master' into plip10359-z3cform-controlpanel

Conflicts:
	plone/app/upgrade/v50/alphas.py