Adding the valid constants for constrain settings to the interface
Removed usage in plone.app.content. Made no sense anyway
merge pull #44 into master
Trigger an event when reindexOnReorder happens

The original implementation does nothing because a clever indexer
can get up to date information without a reindex.
collective.solr needs the reindex, by throwing an event, we
allow collective.solr to handle the issue
Merge branch 'master' of git://github.com/plone/Products.CMFPlone
Fail with good error message
Merge remote-tracking branch 'origin/master' into plip10886-event-improvements