most of the code for creating/printing labels with tests and test data
printing section added to teh config file; getting printer url added and tested
tests for getting container info; code for data manipulation
length option for signature module; code fixes and tests for label creating; correct label formatting fro a plate
barcode generation with two char prefix; barcode module clean-up; generation of short  capital letter signatures; barcode prefix supplied for barcode generation; trim user name if toolong
Merge branch 'devel' of github.com:wtsi-clarity/wtsi_clarity into devel
build file and changes update
Merge pull request #20 from mgcam/devel

label generation and printing