Simplify MapNest while squashing some LocVolCalib bugs.
Simplify MapNest while squashing some LocVolCalib bugs.

HIPERFIT/futhark,diku-dk/futhark,diku-dk/futhark,diku-dk/futhark,diku-dk/futhark,diku-dk/futhark,HIPERFIT/futhark,HIPERFIT/futhark