Initial doxygen build added.

Still needs testing.
A 'suite' that just builds the externals.
Add path.
Merge branch 'feature/add-doxygen' into develop
First commit
Tell bumpversion not to autocommit.
Merge branch 'master' into release/0.3.2 to pick up Patrick's SQLite fixes.
Merge branch 'release/0.3.2'