relax SVN archive

Bug fix for back_calc_ri()!

The bug was introduced at r10967. The check for missing data was not performing correctly, causing
the Monte Carlo simulations to be stuck in an infinite loop!

Fix for the cone_edge() function for a non-zero apex position.

Various point distributions can now be used for the cone PDB representations.

This includes the original 'uniform' distribution and now the 'regular' distribution.

Renamed the pivot point to the apex in create_cone_pdb().

Bug fix for create_cone_pdb() for when a rotation matrix is supplied.

The cone central axis was not being rotated!

Bug fix for cone_edge() for when a rotation matrix is supplied.

The latitude points were not being rotated.

Fix for create_cone_pdb() for when a rotation matrix is supplied.

Created the new fn create_cone_pdb() which can be used to create PDB file representations of cones.

cone_pdb() now takes the new EDG residue for the cone edge into account.

Rewrote the stitch_cone_to_edge() function to handle the arbitrarily shaped cones.