prototypical refClass objects now print w/o error


git-svn-id: https://svn.r-project.org/R/trunk@66666 00db46b3-68df-0310-9c12-caf00c1e9a41
cosmetic

git-svn-id: https://svn.r-project.org/R/trunk@66667 00db46b3-68df-0310-9c12-caf00c1e9a41
all.equal() fixes for "refclass prototypes"; docu print(), str() fixes

git-svn-id: https://svn.r-project.org/R/trunk@66668 00db46b3-68df-0310-9c12-caf00c1e9a41