Create and use HasPermission.checkPermission

To include superuser checks and standardize permissions.  There may be a
few lingering omissions.
Fix warning
Merge branch 'master' of github:databrary/play

Conflicts:
	app/views/crud/partyHeader.scala.html
Fix everybody link
Fixed records form interface (temporary, but good).

Closes #146
Merge remote-tracking branch 'remotes/origin/master' into gui

Conflicts:
	app/models/container.scala
	app/models/volume.scala