Volocity Clipping: support files with multiple individual channels

This does not address RGB files, but should work for non-RGB
multi-channel data.  Physical pixel sizes and channel names should also
be parsed, if present.

Conflicts:

	components/bio-formats/src/loci/formats/in/VolocityClippingReader.java
Volocity Clipping: fix reading of DIC channels

The DIC channel often contains a single plane which needs to be
duplicated across all Z sections.  This prevents attempting to read
planes beyond the end of the file, and instead uses the first plane from
the channel.
Volocity Clipping: fine tune first pixels offset calculation
merge develop -D org -I include -E exclude: PR 528 (Tile performance improvements for VMS and NDPI)
merge develop -D org -I include -E exclude: PR 796 (Zip: improve reader and handle performance)
merge develop -D org -I include -E exclude: PR 804 (Leica LIF: 'C' goes before other dimensions if SizeC and SizeT > 1)
merge develop -D org -I include -E exclude: PR 807 (CellWorx: ignore thumbnails and missing channel names (rebased onto develop))
merge develop -D org -I include -E exclude: PR 810 (Preserve lookup tables when exporting from ImageJ)
merge develop -D org -I include -E exclude: PR 816 (Add support for multi-channel Volocity Clipping datasets)