critical bug fix to AbPval in C code for good fits less than 26 failures.  Index into table was adjusted in wrong direction after CCC.  Bug should have limited scope.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/abernethy@91 edb9625f-4e0d-4859-8d74-9fd3b1da38cb