add weight, offset args; implements concurrent effects of functional covariates

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/refund@156 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
implements coef-method for pcre-terms

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/refund@157 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
version bump (pffr no knows concurrent effects, weights/offsets; coef.pffr work for pcre)


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/refund@158 edb9625f-4e0d-4859-8d74-9fd3b1da38cb