doc: updated WHATSNEW and tagged changelogs.

doc: fixes. added a link to the manual.

doc: fix WHATSNEW link.

doc: removed unused full network use diagram.

Prepared for version 1.99.1. Removed obsolete directory.

Doc update and version file added.

doc update.

docu: link to WHATSNEW was broken when generated on Linux

Doxygen named the file _w_h_a_t_s_n_e_w.html, and front page referred
to it as whatsnew.html

Documentation updates

Fixed a bug in the mobility example.