Generate the autosql for DESeq results (to create bigBed)

        Returns a temp filename containing the autosql defining the extra
        fields.

        This for creating bigBed files from BED files created by
        colormapped_bed.  When a user clicks on a feature, the DESeq results
        will be reported.

def autosql_file(self):
        """
        Generate the autosql for DESeq results (to create bigBed)

        Returns a temp filename containing the autosql defining the extra
        fields.

        This for creating bigBed files from BED files created by
        colormapped_bed.  When a user clicks on a feature, the DESeq results
        will be reported.
        """
        fn = pybedtools.BedTool._tmp()

        AUTOSQL = dedent(
            """
            table example
            "output from DESeq"
            (
            string  chrom;  "chromosome"
            uint chromStart; "start coord"
            uint chromEnd; "stop coord"
            string name; "name of feature"
            uint score; "always zero"
            char[1] strand; "+ or - for strand"
            uint    thickStart; "Coding region start"
            uint    thickEnd;  "Coding region end"
            uint reserved; "color according to score"
            string padj; "DESeq adjusted p value"
            string pval; "DESeq raw p value"
            string logfoldchange; "DESeq log2 fold change"
            string basemeana; "DESeq baseMeanA"
            string basemeanb; "DESeq baseMeanB"
        )
        """)

        fout = open(fn, 'w')
        fout.write(AUTOSQL)
        fout.close()
        return fn