comment out unused worldsize
start xyz coordinate system
xyz for tools
rm util/index.go
xyz demag kernel
array indexing now by Z,Y,X
indexing functions are x,y,z.
slice get/set in x,y,z
conv selftest not out of bounds
minor cleanup
minor cleanup
conv
start to convert convolution to xyz
move convolution to xyz
demag debug output
nicer printing
stash
stash
xyz copypad
xyz stencil macro