onboard: init at 1.4.1

Add testing reqs, but keep tests disabled

Tests are runnable but still produce errors.

To get tests working, add locale setting, replace killall
and add nose package. To run the tests enable 'doCheck'.

Hunspell needs to be explicitly installed to use.

Patch SpellCheck.py to put hunspell in system datadir location.
For example, '/var/run/current-system/sw/share/hunspell/'
or '${HOME}/.nix-profile/share/hunspell/'

To get rid of atspi errors set
'services.gnome3.at-spi2-core.enable = true'