Length: pinhole and working distance
Use Length for pinhole size and working distance
Merge branch 'units-length2' of github.com:rleigh-dundee/bioformats into rleigh-dundee-units-length2

Conflicts:
	components/formats-gpl/src/loci/formats/in/CellVoyagerReader.java
Merge branch 'rleigh-dundee-units-length2' into units-length