Add support for pagination of multi-value fields

[bobbingwide]

Some fields stored in post meta data may contain a lot of data. Either there are multiple values, each stored separately in a wp_postmeta row, or the data is stored in a textarea field, with each line representing separately displayable content.

The values should be paginatable, ideally with pagination being ajaxified.

For these large fields, it makes sense to add pagination to the [bw_field] / [bw_fields] shortcodes. Alternatively, the [bw_navi] shortcode could be extended to support selection of the field to be displayed, using a new field=field_name parameter.

Proposed solution

Develop the extension to [bw_navi] first.

[bobbingwide]

This was raised against the wrong repo. It's now been raised as http://github.com/bobbingwide/oik/issues/25