Added a few tests to PrismMesh
Added a few tests to PrismMesh

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