Add messages informing the user about the download status

There is now some uptake before the actual download progress bar shows.
While this could be optimized a bit probably, it's good to inform the
user that there is actually something going on in the background.

Using plain print instead of logging, because progress bar prints anyway.

scopesim/server/database.py

@@ -490,9 +490,13 @@ def download_packages(pkg_names: Union[Iterable[str], str],
     """
     base_url = rc.__config__["!SIM.file.server_base_url"]
 
+    print("Gathering information from server ...")
+
     all_versions = get_all_package_versions()
     folder_dict = get_package_folders()
 
+    print("Connection successful, starting download ...")
+
     if isinstance(pkg_names, str):
         pkg_names = [pkg_names]