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?