Change from article to book class.

Granularity of sectioning was not fine enough. book chosen over report
for semantics.

Replace:
    section       -> chapter
    subsection    -> section
    subsubsection -> subsection

Change relevant labels.
Fix page issue.

Several 'blank' pages.  Replace documentclass option, twoside with
oneside.
Separate detailed subsections into subsubsections.
Tidy up a little.
Merge branch 'feature/book' into develop

Need finer grained structure.