[RobExtremes] provide wrapper for ismev-diagnostics ie gev.diag, gev.prof, gev.profxi, gpd.diag, gpd.prof, gpd.profxi

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/robast@784 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
[RobExtremes] updated NEWS and minimal change in startEstGEV.R and startEstGPD.R

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/robast@785 edb9625f-4e0d-4859-8d74-9fd3b1da38cb