Added a small section on the barcoding data that is written into the cmp.h5 file. It has been a while since I have written in this specification so some cleaning maybe needed. 

Bug 23227

[git-p4: depot-paths = "//depot/software/bioinformatics/doc/FileFormats/": change = 125947]
Document the 2.3 chemistry encoding/decoding paradigm

[Tracking bug 24842]

[git-p4: depot-paths = "//depot/software/bioinformatics/doc/FileFormats/": change = 135052]
Begin a document on the chemistry decoding philosophy

[Tracking bug 24842]

[git-p4: depot-paths = "//depot/software/bioinformatics/doc/FileFormats/": change = 135298]
Add more details

[Tracking bug 24842]

[git-p4: depot-paths = "//depot/software/bioinformatics/doc/FileFormats/": change = 135299]
Formatting

[Tracking bug 24842]

[git-p4: depot-paths = "//depot/software/bioinformatics/doc/FileFormats/": change = 135300]
End-to-end principle

[Tracking bug 24842]

[git-p4: depot-paths = "//depot/software/bioinformatics/doc/FileFormats/": change = 135301]
Clarify bax.h5 requirement

[Tracking bug 24842]

[git-p4: depot-paths = "//depot/software/bioinformatics/doc/FileFormats/": change = 135302]