Corrected Matlab script contact.m

[arango]

Couple of bugs were reported in the matlab/grid/contact.m used to compute all the contact regions and contact points data for nesting.

This ticked was re-opened again because there were still couple of errors when setting mask_v. We need to have:

     C.mask_v   = G(rg).mask_v(IN);

instead of

     C.mask_v   = G(rg).mask_u(IN);

Many thanks to Chris Edwards for ​reporting this problem.

[arango]

This ticked was re-opened.