NAME
miopen_volume - open a volume for reading
SYNOPSIS
#include <minc2.h>
int miopen_volume(const char *filename,
int mode,
mihandle_t *volume);
DESCRIPTION
Opens an existing MINC volume for read-only access if mode argument is
MI2_OPEN_READ, or read-write access if mode argument is MI2_OPEN_RDWR.
RETURN VALUE
Returns MI_NOERROR on success or MI_ERROR on failure.