DEP: support old import name for applications

Allow their import with DeprecationWarning.

Author: pavoljuhas

src/diffpy/structure/applications/__init__.py

@@ -0,0 +1,29 @@
+#!/usr/bin/env python
+##############################################################################
+#
+# diffpy.structure  Complex Modeling Initiative
+#                   (c) 2019 Brookhaven Science Associates,
+#                   Brookhaven National Laboratory.
+#                   All rights reserved.
+#
+# File coded by:    Pavol Juhas
+#
+# See AUTHORS.txt for a list of people who contributed.
+# See LICENSE.txt for license information.
+#
+##############################################################################
+
+"""
+Import support for renamed subpackage diffpy.structure.applications.
+
+This module is deprecated and will be removed in version 3.1.
+"""
+
+# TODO remove this module in version 3.1.
+
+from warnings import warn
+
+
+warn("Module 'diffpy.structure.applications' is deprecated.  "
+     "Import 'diffpy.structure.apps' instead.",
+     DeprecationWarning, stacklevel=2)

src/diffpy/structure/applications/anyeye.py

@@ -0,0 +1,14 @@
+#!/usr/bin/env python
+
+"""
+Temporary support for old import name.
+
+This module is deprecated and will be removed in version 3.1.
+"""
+
+# TODO remove this module in version 3.1.
+
+from diffpy.structure.apps.anyeye import main
+
+if __name__ == "__main__":
+    main()

src/diffpy/structure/applications/transtru.py

@@ -0,0 +1,14 @@
+#!/usr/bin/env python
+
+"""
+Temporary support for old import name.
+
+This module is deprecated and will be removed in version 3.1.
+"""
+
+# TODO remove this module in version 3.1.
+
+from diffpy.structure.apps.transtru import main
+
+if __name__ == "__main__":
+    main()