NAME
midefine_label - define a label value for a labelled volume.
SYNOPSIS
#include <minc2.h>
int midefine_label ( mihandle_t volume,
int value,
const char *name );
DESCRIPTION
This function associates a label name with an integer value for the given
volume. Functions which read and write voxel values will read/write
in integer values, and must call miget_label_name() to discover the
descriptive text string which corresponds to the integer value.
RETURN VALUE
MI_NOERROR on success, or MI_ERROR on failure.