Support Inherited Formatter module

The Inherited Formatter module allows a field to inherit the value of a "parent" node that is related via a node-reference field. See the Inherited Formatter project page for more information.

To add support for this feature, field modules must declare which field types are supported by implementing hook_inheritedformatter_supported_fields_info(). (Not all CCK fields work out of the box, such as filefields.)

This patch adds that support for the formatted_number field types.

This patch is trivial and low risk, so I am bumping directly to RTBC.