all.equal(., tolerance=*) {instead of 'tol=*'}

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/rmpfr@181 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
+ dbinom(), dpois(), dnorm()

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/rmpfr@182 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
new R_mpfr_check_prec() {in C, inlined} -> to prevent "assert aborts";
three new utilities -- working only *partly*: 
C:  R_mpfr_get_erange, R_mpfr_set_erange, R_mpfr_prec_range; 
R: .mpfr.maxPrec(), .mpfr.minPrec(),  .mpfr.erange(kind), and .mpfr.erange<-


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/rmpfr@183 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
add `dbg_level` argument to R_mpfr_dbg_printf(); use it to debug R_mpfr_prec_range() etc -- "fix" code by returning *double* now (instead of 64-bit int which we do not have; returning mpfr() would be overkill

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/rmpfr@184 edb9625f-4e0d-4859-8d74-9fd3b1da38cb