Length: wavelength - transmittance
XMLMockObjects: Fix usage of Length.
FormatTools: PositiveInteger becomes Length.

Conflicts:
	components/formats-api/src/loci/formats/FormatTools.java
Fix readers using PositiveInteger.
Fix unit test.
Merge pull request #13 from bpindelski/transmittance-wavelength

Length: wavelength - transmittance
Length: wavelength - emission and excitation
Length: well origin
Use Length for plate well origin
Fix Channel wavelengths to use Length quantity
Merge pull request #14 from rleigh-dundee/units-length

Units: Length for plate well origin
Fix ICSReader
Fix duplicate imports
Merge pull request #16 from sbesson/units-length

Units length: channel wavelengths
Fix test-suite for channel wavelengths
Merge pull request #17 from sbesson/units-length

Fix test-suite for channel wavelengths
Merge remote-tracking branch 'andrew/units-length' into units-length

Conflicts:
	components/formats-gpl/src/loci/formats/in/FV1000Reader.java
	components/formats-gpl/src/loci/formats/in/FlexReader.java
	components/formats-gpl/src/loci/formats/in/LIFReader.java
	components/formats-gpl/src/loci/formats/in/ZeissLSMReader.java