Test Bounded Z-Slice Intermediates

[den-sq]

Test different approach for file intermediates, writing to bounded Z-slices.

• Determine which chunks for each z-slice
• Create chunks (same translation / values / weights mapping) as needed.
• Write upon Z-slice chunks.
• Upon all chunks for a z-slice completion, translate to full domain and resave.

[den-sq]

Closed by #44