Update docs
Update release note
Fix leftovers from merge conflict
Fix Sphinx documentation

Perpetual version string and copyright year.
Fix Sphinx warnings.
Do not provide custom values by default in config file
display users without username correctly
Merge pull request #379 from thillux/master

display users without username correctly
Merge commit 'ba04266deeeaf01797e94ffa3533a7440cfef505' into develop

Conflicts:
	NEWS
Merge branch 'develop' of github.com:nicolargo/glances into develop