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