fix(viirs_pkt_size): Make sure output is written to cwd

scripts/viirs_pkt_size.py

 #!/usr/bin/env python
+import os
 import numpy as np
 import netCDF4
 from edosl0util import jpssrdr
@@ -51,6 +52,6 @@ if __name__ == '__main__':
     parser = argparse.ArgumentParser()
     parser.add_argument('viirs_rdr')
     args = parser.parse_args()
-    destpath = args.viirs_rdr + '.size.nc'
+    destpath = os.path.basename(args.viirs_rdr) + '.size.nc'
     scans, sizes = read_data_from_rdr(args.viirs_rdr)
     write_netcdf_file(destpath, scans, sizes)