Change application-wide default color map to grayscale
Change application-wide default color map to grayscale

cryos/tomviz,cjh1/tomviz,mathturtle/tomviz,thewtex/tomviz,OpenChemistry/tomviz,cjh1/tomviz,OpenChemistry/tomviz,cryos/tomviz,mathturtle/tomviz,mathturtle/tomviz,thewtex/tomviz,cryos/tomviz,OpenChemistry/tomviz,cjh1/tomviz,OpenChemistry/tomviz,thewtex/tomviz