now testing for Mpfr >= 3.0.0

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/rmpfr@206 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
is.finitef(M), is.na(M) etc now return arrays/matrices for "mpfrArray" inputs

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/rmpfr@207 edb9625f-4e0d-4859-8d74-9fd3b1da38cb