The interpretation of [capaths] is not correct in Realm.parseCapaths().

1. A list is always returned even if there's no path
2. The search does not stop when a direct trust (".") is found.

Also, in the hierachical algorithm Realm.parseHierarchy(). there are some issues:

1. A->B's path is [A]. Shouldn't it be null?
2. A.COM->B.COM's path is [A.COM, COM]. Shall we accept COM as an existing intermediary?