texture3d testing, fixes, refactoring, coverage #3699
Merged
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More extensive testing of texture3d: handle vs filename, subimages,
more than 4 channels, closest sample interpolation.
Fixes for tex3d > 4 chan that turned out to be broken.
Some rearrangement for the >4 channel case
Refactor and simplify accum3d_sample_bilinear so multiple data types all use the same templated code path.
This all reduces the amount of untested code in OIIO by another 0.4%.