Moved cache stuff from Objective to Misfit
Moved cache stuff from Objective to Misfit

Misfit was the only one using it so it should have it.

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