[Kst] kdeextragear-2/kst/kst

[Rick Chern]

CVS commit by rchern: 

- use KstViewObject::_backgroundColor and _foregroundColor to store plot colours
- use accessor/modifier functions already existing


  M +27 -34    kst2dplot.cpp   1.133
  M +0 -5      kst2dplot.h   1.58
  M +4 -4      kstplotdialog_i.cpp   1.48