doc: fix most occurences of FU as an author

.. but only if there are other authors as well
Merge pull request #1490 from LudwigOrtmann/noauthor

doc: fix all occurences of FU as author
doc: some more author fixes

fix all occurences of INRIA as an author
correct Oliver Hahms authorship and indentation
Merge pull request #1491 from LudwigOrtmann/noauthor2

doc: some more author fixes
drivers: Provide basic interface for all network devices
drivers: Make general IEEE 802.15.4 driver part of net_dev