updated version to 5.2.1, updates to make version bumps easier, and updated changelog

ns3/setup.py.in

@@ -0,0 +1,20 @@
+import glob
+
+from setuptools import setup
+
+_EXAMPLES_DIR = "share/corens3/examples"
+
+setup(
+    name="core-ns3",
+    version="@PACKAGE_VERSION@",
+    packages=[
+        "corens3",
+    ],
+    data_files=[(_EXAMPLES_DIR, glob.glob("examples/*"))],
+    description="Python ns-3 components of CORE",
+    url="http://www.nrl.navy.mil/itd/ncs/products/core",
+    author="Boeing Research & Technology",
+    author_email="core-dev@nrl.navy.mil",
+    license="GPLv2",
+    long_description="Python scripts and modules for building virtual simulated networks."
+)