Adding progression messages.

scripts/copypaste_bigwig_regions.py

@@ -91,10 +91,13 @@ def main():
     region_extractor = itemgetter("chrom", "start", "end")
     from_region = region_extractor(config["from_region"])
     to_region = region_extractor(config["to_region"])
+    print(f"Copying {from_region} of {config['from_bw']} "
+          "into {to_region} of {config['to_bw']}")
     paste_bigwig_region(
         config["from_bw"], config["to_bw"],
         from_region, to_region,
         config["dest_bw"])
+    print(f"Results written in {config['dest_bw']}")
 
     return 0