Revised restrictions for value classes and unversal traits

and brought compiler in line with them. One thing we can accept IMO are nested
classes (nested objects are still a problem). In fact, it makes no sense to
exclude nested classes from value classes but not from universal traits. A class
nested in universal trait will becomes a class nested in a value class by
inheritance. Note that the reflection library already contains a universal trait
with a nested class (IndexedSeqLike), so we should accept them if we can.

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