Make cakegridcreator work for the case that the well is not excluded from the grid
At the moment it seems that the cakegridcreator only works if the well is excluded from the grid. This allows to use cubic cells. However, if the well is for example modelled using a line source, the well should not be excluded from the grid.
Thus, it would be nice if this gridcreator could generate a grid where the well is not excluded. This could be done by using prism cells at the well location.