[authors] Writer Guide Chapter 8 (Working with Graphics) revised

[Jean Hollis Weber]

I have revised Chapter 8 (Working with Graphics) of the Writer Guide, 
updated it to OOoV3.2 (including screenshots), rewritten some 
sections, added some material, and submitted it for review.

http://www.oooauthors.org/english/userguide3/writer3/V_3.0_drafts/0208WG3-WorkingWithGraphics_JHW_20091018.odt/view
--Jean