adjust documentation of ess-describe-object-at-point

git-svn-id: https://svn.r-project.org/ESS/trunk@5806 0bbaf3bd-34e0-0310-bf65-c717079852d4
load/install ESSR at the very end.

   install.packages might ask for y/n input and thus that hangs emacs :(

   Try to address #55

git-svn-id: https://svn.r-project.org/ESS/trunk@5807 0bbaf3bd-34e0-0310-bf65-c717079852d4
Merge branch 'trunk'