[p6object]: Merge changes from mutamerge branch * Add PROTOOVERRIDES to say which class methods   override protoobject methods. * Clean up .ACCEPTS to do class/role-based smart   matching (i.e., isa + does).
[p6object]: Merge changes from mutamerge branch
* Add PROTOOVERRIDES to say which class methods
  override protoobject methods.
* Clean up .ACCEPTS to do class/role-based smart
  matching (i.e., isa + does).


git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@27971 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

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