Allow vectorised calls to AUCLim and STP in qfa.fit function: this lets us generate ranges of numerical fitnesses

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/qfa@621 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Change default nAUC to latest when passing a list, rather than earliest

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/qfa@622 edb9625f-4e0d-4859-8d74-9fd3b1da38cb