Upated matlab scripts to compute ROMS vertical coorditnates

[arango]

Removed the restriction that hc, the critical thickness controlling the vertical transformation, needs to be less or equal than the minimum depth (hmin) of a particular application when using Vtransform=2. Actually, hc can be any positive value and the tranformation works in both cases when hc < hmin and hc > 0. This is one of the main advantages of the new transformation.

This restriction only applies for the old transformation Vtransform=1.