multiallelic normalization (just for INFO FREQ of dbsnp) for fetch_vcf, prefer normalized vcf...

src/io/vcf.rs

@@ -263,7 +263,7 @@ mod tests {
     #[test]
     fn vcf_dbsnp() -> anyhow::Result<()> {
         let config = Config::default();
-        let v = fetch_vcf(&config.db_snp, &GenomeRange::new("chr1", 5656, 5657))?;
+        let v = fetch_vcf(&config.db_snp, &GenomeRange::new("chr1", 5656, 5660))?;
         println!("{v:#?}");
         Ok(())
     }