Minor typo fixing and give a brief overview of using Icicles with ESS.
Also mention ess-first-tab-never-complete and add index entries.


git-svn-id: https://svn.r-project.org/ESS/trunk@5431 0bbaf3bd-34e0-0310-bf65-c717079852d4
Editing Icicles section.


git-svn-id: https://svn.r-project.org/ESS/trunk@5432 0bbaf3bd-34e0-0310-bf65-c717079852d4
julia: less "R" in its docu; use require() instead of load() as "they tell you" -- still does "not work": no output is printed

git-svn-id: https://svn.r-project.org/ESS/trunk@5433 0bbaf3bd-34e0-0310-bf65-c717079852d4