CVS commit by mecir: 

Some code clean-ups, preparation for the new dependency manager...


  M +2 -2      dependencies.cc   1.5
  M +2 -1      kspread_aboutdata.h   1.29
  M +180 -247  kspread_cell.cc   1.625
  M +5 -11     kspread_cell.h   1.193
  M +25 -0     kspread_sheet.cc   1.622
  M +4 -0      kspread_sheet.h   1.297