Add "chr", "gene_name" in xpore-dataprep, xpore-diffmod

[ploy-np]

{
	<gene_id>: {
		<genomic_position>: {
			<kmer>:{
				"norm_means": array of float with 2 decimal points,
				"read_ids": array of string.
			}
		}
		"chr": <chr>
		"gene_name": <gene_name>
	}
}

[ploy-np]

I use gene_id instead of chr and gene_name because I want to keep the format of data.json to be consistent with when transcript_id is used.

[ploy-np]

However, chr and gene_name may be included in the final result table?