Revert "Bug fix in mesher.TesseroidMesh: dims was giving negative dz"
Revert "Bug fix in mesher.TesseroidMesh: dims was giving negative dz"

This reverts commit a666b292bbb5e2cb20967510bc6bc7c3e401fc2b.

eusoubrasileiro/fatiando,mtb-za/fatiando,drandykass/fatiando,santis19/fatiando,fatiando/fatiando,cmeessen/fatiando,victortxa/fatiando,fatiando/fatiando,eusoubrasileiro/fatiando,rafaelmds/fatiando,eusoubrasileiro/fatiando,santis19/fatiando,mtb-za/fatiando,drandykass/fatiando,eusoubrasileiro/fatiando_seismic,cmeessen/fatiando,eusoubrasileiro/fatiando_seismic,rafaelmds/fatiando,victortxa/fatiando