don't block "public" messages with authenticated scope
Merge pull request #563 from zzottel/master

don't block "public" messages with authenticated scope
bring back some friendica crypto stuff including all the key mangling and translation functions. Also add ability to completely supress email notifications for actitivies with private contents. We'll still pass private mail notifications because often the email notification is the only way infrequently used channels get alerted to these.
Merge https://github.com/friendica/red into pending_merge
Merge remote-tracking branch 'upstream/master'