[workflow] node edit & acl rules

[peter]

Current situation: When editing a node the ACL rules that are set are not visible anymore. This is due problem as described at this comment: http://mediamosa.org/trac/ticket/409#comment:3

Problem: changing mediafile id's. This problem will be over after #448. Other problem is that acl now only applies to the original.

Desired situation:

• 1) user can edit the ACL rules.
• 2) ACL's rules should apply to all mediafiles, not just original.
• 3) The fieldset ACL should be validated. Because a node without a video it is not possible to set the ACL rules. Message to the end-user that ACL is possible after attaching a video to the node.
• 4) Pay attention to ACL_inherit

[robert]

My notes on implementation of this ticket;

• You can set the acl using mediamosa/$mediamosa_id/acl. Always use replace = true (default)
• transcode_inherits_acl is by default FALSE, this flag enables that new transcode inherits the ACL rules from the original. So make sure when creating the mediafile for upload, the transcode_inherits_acl is set to true.

[forgacs]

@Robert, Peter: I have fixed all the issues you mentioned in this ticket. Ready to review.