MIN: make viridis default cmap, move and enhance intepolation kernel comments
MIN: make viridis default cmap, move and enhance intepolation kernel comments

inclement/vispy,kkuunnddaannkk/vispy,ghisvail/vispy,QuLogic/vispy,inclement/vispy,drufat/vispy,bollu/vispy,RebeccaWPerry/vispy,Eric89GXL/vispy,julienr/vispy,RebeccaWPerry/vispy,julienr/vispy,srinathv/vispy,dchilds7/Deysha-Star-Formation,jdreaver/vispy,inclement/vispy,kkuunnddaannkk/vispy,julienr/vispy,jdreaver/vispy,Eric89GXL/vispy,srinathv/vispy,ghisvail/vispy,QuLogic/vispy,dchilds7/Deysha-Star-Formation,ghisvail/vispy,michaelaye/vispy,srinathv/vispy,michaelaye/vispy,michaelaye/vispy,QuLogic/vispy,dchilds7/Deysha-Star-Formation,RebeccaWPerry/vispy,drufat/vispy,kkuunnddaannkk/vispy,bollu/vispy,bollu/vispy,jdreaver/vispy,drufat/vispy,Eric89GXL/vispy