Cell implementation bug fix
Correcting bugs in vtkCell implementation
- Some implementation do not set subId in evaluatePosition
- Some implementation do not set pcoords in evaluatePosition
- vtkEmptyCell implementation was not complete as it was not setting any output parameters
- Corrected some double "1" into double "1.0"
- Corrected some pcoords = -10.0 en pcoords = -1.0
- Some useless codes have been replaced by vtkNotUsed