Function: Calculates the new dimensions for a downsampled image.

Function: Calculated the new dimensions for a downsampled image.

Function: Legacy function used to generate a link categories checklist control.

Function: Get the real filesystem path to a file to edit within the admin.

Function: Legacy function used for generating a categories drop-down control.

Function: Register a setting and its sanitization callback

Function: Unregister a setting

Function: Was used to filter input from media_upload_form_handler() and to assign a default post_title from the file name if none supplied.