Merge tag 'v2.0' into develop

Release 2.0
Update release note
Fix Sphinx documentation

Perpetual version string and copyright year.
Fix Sphinx warnings.
Do not provide custom values by default in config file
Fix leftovers from merge conflict
Merge commit 'ba04266deeeaf01797e94ffa3533a7440cfef505' into develop

Conflicts:
	NEWS
Merge branch 'develop' of github.com:nicolargo/glances into develop
Merge tag 'issue378' into develop

Correct issue #378
Merge tag 'issue373' into develop

Issue #373
Merge tag 'issue375' into develop

Correct issue #375
Merge tag 'issue319' into develop

Correct issue #319
Windows: change in the highlighting of a process niceness

Highlight the nice value of a process when is different from 32 (normal).
Merge tag 'issue319_v2' into develop

Issue #319 additional except...
Merge branch 'develop' of github.com:nicolargo/glances into develop
Merge tag 'issue319_v3' into develop

Issue #319 v3...
Nice: do not highlight '?' (question mark)
Add missing [monitor] section to glances.conf (disabled by default)

Rules of thumb:
- glances.conf: this is the config file that comes with the source tarball.
  Touch carefully. Not for testing.
- glances-test.conf: this is the config file for testing purposes only.
Release 2.0.1
Merge branch 'release/v2.0.1'
Update docs