Merge pull request #707 from melissalinkert/metamorph-image-names

Metamorph image names
ND2: only populate the channel color if it is non-zero

Setting the channel color to 0 (i.e. black) can prevent the images from
displaying correctly when the color-appropriate lookup tables are applied.
merge dev_4_4 -D org -I include -E exclude: PR 673 (Make configuration file suffix configurable)
merge dev_4_4 -D org -I include -E exclude: PR 710 (Data test updates (rebased onto dev_4_4))
merge dev_4_4 -D org -I include -E exclude: PR 711 (ImageConverter: fix dimensions of the last tile)
merge dev_4_4 -D org -I include -E exclude: PR 717 (ND2: only populate the channel color if it is non-zero)