[authors] Calc Ch6 (DataPilot) ready for review

[Jean Hollis Weber]

Dick Detwiler did a great job amending this chapter to answer my 
questions. Thanks, Dick!

I have made some minor copyediting changes to Dick's work and 
submitted it for another review.
http://oooauthors.org/en/authors/userguide2/calc/feedback/0306_data_pilot_08Feb07_RLD_JHW.odt
--Jean