[tutorial] Introduce more waf options and best work practices.
[Bug 1786] Make cairo implementation type accessible.
[Bug 1786] Fix undeclared identifiers cairo_impl64 and cairo_impl128 in int128 builds.
One waf to rule them all.
NetAnim: Allow metadata as default in the examples
NetAnim: Update Documentation
NetAnim: Add figures
[Bug 1852] Restore missing config header
Bug 1855 - SixLowPanNetDevice is not correctly indexed