Changed default indVars to ye, logtemp & logrho
-Removed much logvar checking and replaced with
 validatePointDict: checks if indVars should be
 log + indVar and replaces them.
 * Can now specify either temp, rho or  logtemp, logrho
   (or any combination) when passing a pointDict!
-Needs more testing
-function option in solveForQuantity needs implementing