core: move common.hpp to core/

Headers in core/ are now included as `#include "core/*.hpp"`.
This allows NFD to rely less on include paths when used as a submodule in
another codebase, such as ndnSIM and NFD-Android.

refs #3127

Change-Id: Ia38f3c97427e17ff7b5401281f1fe875b5d5313e

tests/wscript

@@ -1,12 +1,13 @@
 # -*- Mode: python; py-indent-offset: 4; indent-tabs-mode: nil; coding: utf-8; -*-
 
 """
-Copyright (c) 2014  Regents of the University of California,
-                    Arizona Board of Regents,
-                    Colorado State University,
-                    University Pierre & Marie Curie, Sorbonne University,
-                    Washington University in St. Louis,
-                    Beijing Institute of Technology
+Copyright (c) 2014-2016,  Regents of the University of California,
+                          Arizona Board of Regents,
+                          Colorado State University,
+                          University Pierre & Marie Curie, Sorbonne University,
+                          Washington University in St. Louis,
+                          Beijing Institute of Technology,
+                          The University of Memphis.
 
 This file is part of NFD (Named Data Networking Forwarding Daemon).
 See AUTHORS.md for complete list of NFD authors and contributors.
@@ -36,7 +37,7 @@ def build(bld):
             features='cxx pch',
             source=bld.path.ant_glob(['*.cpp'], excl='main.cpp'),
             use='core-objects',
-            headers='../common.hpp boost-test.hpp',
+            headers='../core/common.hpp boost-test.hpp',
             defines='UNIT_TEST_CONFIG_PATH=\"%s/tmp-files/\"' % bld.bldnode,
           )