Length: wavelength - light sources
Fix Mock objects.
Length: wavelength - emission and excitation
Length: well origin
Return length object.

To avoid conflict, I did not use import...
Use Length for plate well origin
Modify readers to support length quantity for wavelength.
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
Modify initial commit introduced to avoid conflict.
Merge pull request #18 from jburel/units-length

Units length
Length: ROI font size
FormatTools: return Length for getFontSize().
Use Length for font size where applicable.