Add tables explicitly as namespaced packages (#372)

setup.py

@@ -2,7 +2,7 @@
 # -*- coding: utf-8 -*-
 
 import sys
-from setuptools import setup, find_packages
+from setuptools import setup
 from pathlib import Path
 
 
@@ -33,7 +33,8 @@
     author_email='johan.vandewauw@inbo.be',
     license='MIT',
     install_requires=requirements,
-    packages=['niche_vlaanderen'],
+    packages=["niche_vlaanderen", "niche_vlaanderen.system_tables",
+              "niche_vlaanderen.system_tables.flooding"],
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Intended Audience :: Science/Research',