DAWNSCI-5681 add option to use form sample thickness
DAWNSCI-5681 continue putting parameter through pipeline
DAWNSCI-5681 add new parameter to GUI
DAWNSCI-5681 start using sample thickness
DAWNSCI-5681 move absolute scaling to appropriate place in code

 * using the thickness from the file requires a filename, which is not
   available until it is provided for the process() method

Conflicts:
	uk.ac.diamond.scisoft.ncd.passerelle.actors/src/uk/ac/diamond/scisoft/ncd/passerelle/actors/service/DataReductionServiceImpl.java
DAWNSCI-5681 add new configuration to test with thickness parameter
DAWNSCI-5681 updated Nexus file to add thickness field