Writer/ToDo/Character Unit added

Character Unit--Adding a new measurement unit for CJK users

Function description

OpenOffice.org does have some measurement units such as cm/mm/inch etc. used for writing typesetting, while it's not sufficient for CJK users, especially referring to indent, line space, character space, ruler and so on. So we need to add an measurement unit named "character unit" for CJK users to avoid the messed layout because of font type and font size changes, for example. the specification of this new feature