new arguments inS and inTime in bhist() base-learner, to fit effects that are smooth, linear or constant in direction of s or t. 
handling of col in funplot().

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/fdboost@105 edb9625f-4e0d-4859-8d74-9fd3b1da38cb