two new ess-doc functions for manual and reference lookup

git-svn-id: https://svn.r-project.org/ESS/trunk@5738 0bbaf3bd-34e0-0310-bf65-c717079852d4
julia: implement manual and reference lookup

git-svn-id: https://svn.r-project.org/ESS/trunk@5739 0bbaf3bd-34e0-0310-bf65-c717079852d4
julia: help allows non help objects

git-svn-id: https://svn.r-project.org/ESS/trunk@5740 0bbaf3bd-34e0-0310-bf65-c717079852d4
cosmetic

git-svn-id: https://svn.r-project.org/ESS/trunk@5741 0bbaf3bd-34e0-0310-bf65-c717079852d4