store envRefClass "default methods" so we can disregard them when comparing objects


git-svn-id: https://svn.r-project.org/R/trunk@66590 00db46b3-68df-0310-9c12-caf00c1e9a41
all.equal.envRefClass()  even smarter
    still not ok ==> currently too tolerant {better than the other way around}


git-svn-id: https://svn.r-project.org/R/trunk@66591 00db46b3-68df-0310-9c12-caf00c1e9a41