contrib: Fix several includes, and a missing copyright header

The copyright header was removed, apparently by mistake,
in c310c29a7712a06fe68fcb838b8c8a64caa5914b. I've put the
header back, carefully referencing the original to be
certain that I'm not inadvertently changing the copyright
status.

contrib/src/ai/aiBehaviors.cxx

@@ -13,6 +13,17 @@
 
 #include "aiBehaviors.h"
 
+#include "arrival.h"
+#include "evade.h"
+#include "flee.h"
+#include "flock.h"
+#include "obstacleAvoidance.h"
+#include "pathFind.h"
+#include "pathFollow.h"
+#include "pursue.h"
+#include "seek.h"
+#include "wander.h"
+
 using std::cout;
 using std::endl;
 using std::string;

contrib/src/ai/aiGlobals.h

@@ -15,7 +15,6 @@
 #define _AI_GLOBALS_H
 
 #include "config_ai.h"
-#include "pandaFramework.h"
 #include "textNode.h"
 #include "pandaSystem.h"
 

contrib/src/ai/arrival.cxx

@@ -13,6 +13,9 @@
 
 #include "arrival.h"
 
+#include "pursue.h"
+#include "seek.h"
+
 Arrival::Arrival(AICharacter *ai_ch, double distance) {
   _ai_char = ai_ch;
 

contrib/src/ai/obstacleAvoidance.cxx

@@ -13,6 +13,8 @@
 
 #include "obstacleAvoidance.h"
 
+#include "aiWorld.h"
+
 ObstacleAvoidance::
 ObstacleAvoidance(AICharacter *ai_char, float feeler_length) {
   _ai_char = ai_char;

contrib/src/ai/pathFind.cxx

@@ -13,6 +13,8 @@
 
 #include "pathFind.h"
 
+#include "pathFollow.h"
+
 using std::cout;
 using std::endl;
 using std::string;

contrib/src/ai/pathFollow.cxx

@@ -1,6 +1,20 @@
+/**
+ * PANDA 3D SOFTWARE
+ * Copyright (c) Carnegie Mellon University.  All rights reserved.
+ *
+ * All use of this software is subject to the terms of the revised BSD
+ * license.  You should have received a copy of this license along
+ * with this source code in a file named "LICENSE."
+ *
+ * @file pathFind.cxx
+ * @author Deepak, John, Navin
+ * @date 2009-10-24
+ */
 
 #include "pathFollow.h"
 
+#include "pathFind.h"
+
 PathFollow::PathFollow(AICharacter *ai_ch, float follow_wt) {
     _follow_weight = follow_wt;
   _curr_path_waypoint = -1;

contrib/src/rplight/shadowAtlas.h

@@ -28,7 +28,7 @@
 #define SHADOWATLAS_H
 
 #include "pandabase.h"
-#include "lvecBase4.h"
+#include "luse.h"
 
 NotifyCategoryDecl(shadowatlas, EXPORT_CLASS, EXPORT_TEMPL);