deal with env variables

scripts/merge_skymodels.py

@@ -3,7 +3,7 @@
 Append a LOFAR skymodel to an existing one
 """
 
-import logging
+import os, logging
 import lsmtool
 
 ########################################################################
@@ -36,4 +36,4 @@ if __name__ == '__main__':
     format_file   = logging.Formatter("%(asctime)s %(levelname)s: %(message)s","%Y-%m-%d %H:%M:%S")
     logging.root.setLevel(logging.INFO)
  
-    main(inmodel1 = args.inmodel1, inmodel2 = args.inmodel2, outmodel = args.outmodel)
+    main(inmodel1 = os.path.expandvars(args.inmodel1), inmodel2 = os.path.expandvars(args.inmodel2), outmodel = os.path.expandvars(args.outmodel))