New poll slides for motion and assignment. (Fixed #862)

Move result table from assignment slide to assignment poll slide.
Use "result" in singular for motion and election results.
Merge pull request #1232 from emanuelschuetze/pollslide-862

Pollslide for motion and assignment (Fixed #862)
Updated English language files.
Merge pull request #1264 from normanjaeckel/Translation

Updated English language files.
Automatic numbering of agenda items
Updated numbering feature.

Fixed organizational item structuring. Prevented organizational items
from having agenda items as descendents. Some coding style changes.
Added CHANGELOG and README entries.
Numbering of agenda items, part 2.

Config item agenda_agenda_fixed removed'.
Config items agenda_agenda_fixed and agenda_enable_auto_numbering removed.
FixAgendaView and ResetAgendaView removed. AgendaNumberingView added.
Old two fix- and reset numbering buttons replaced by 'Number agenda items'.
Fixed bug of numbering view when there are orga items. Renamed toRoman to to_roman.
Merge pull request #1254 from normanjaeckel/AgendaNumbering

Agenda numbering
Updated CHANGELOG, README.rst, requirements files and setup.py.