Gravi3D: A 3D forward modelling software using gravity data to resolve the geometry of subsurface objects

Pre-release of Gravi3D.

The PRISMA routine is fully functional and tested and works with the display routine. It can be used to reproduce the existing models as well as create new models succesfully.

The BGPoly routine is not functional, the calculations have been tested but the I/O has to be adjusted to work with the current input and output format.