Group GFF I/O

I/O functionality for the GFF and GTF file formats.

/*!
 * @defgroup GffIO GFF I/O
 * 
 * @brief I/O functionality for the GFF and GTF file formats.
 * 
 * @tag GffIO#Gff
 * 
 * @brief Tag for selecting the GFF format.
 * 
 * @signature typedef Tag<TagGff_> Gff;
 * 
 * @tag GffIO#Gtf
 * 
 * @brief Tag for selecting the GTF format.
 * 
 * @signature typedef Tag<TagGtf_> Gtf;
 * 
 * @fn GffIO#readRecord
 * 
 * @brief Read one GFF/GTF record from a SinglePassRecordReader.
 * 
 * @signature int readRecord(record, reader[, context[, tag]]);
 * 
 * @param[out] record The GffRecord to write the results to.
 * @param[in,out] reader The SinglePassRecordReader to use for reading.
 * @param[in,out] context The GffIOContext to use for reading. If present then
 *                        ref will be translated to rID using the reference name
 *                        store from context.
 * @param[in] tag The format to read from, one of Gtf and Gff. Note that the
 *                parser transparently parses both GFF and GTF.
 * 
 * @return int A status code, 0 on success, a different value on failures.
 * 
 * @fn GffIO#writeRecord
 * 
 * @brief Writes on GFF/GTF record to a stream.
 * 
 * @signature int writeRecord(stream, record[, context[, tag]]);
 * 
 * @param[in,out] stream The @link StreamConcept @endlink to write to.
 * @param[in] record The @link GffRecord @endlink to write.
 * @param[in] context Optional @link GffIOContext @endlink to use for reference
 *                    ids.
 * 
 * @return int A status code, 0 on success, a different value on errors.
 */