Remove trailing whitespace from most CMake and C/C++ code

Our Git commit hooks disallow modification or addition of lines with
trailing whitespace.  Wipe out all remnants of trailing whitespace
everywhere except third-party code.

Run the following shell code:

git ls-files -z -- \
 bootstrap doxygen.config '*.readme' \
 '*.c' '*.cmake' '*.cpp' '*.cxx' \
 '*.el' '*.f' '*.f90' '*.h' '*.in' '*.in.l' '*.java' \
 '*.mm' '*.pike' '*.py' '*.txt' '*.vim' |
egrep -z -v '^(Utilities/cm|Source/(kwsys|CursesDialog/form)/)' |
egrep -z -v '^(Modules/CPack\..*\.in)' |
xargs -0 sed -i 's/ \+$//'

Source/cmCacheManager.h

@@ -22,7 +22,7 @@ class cmake;
  * \brief Control class for cmake's cache
  *
  * Load and Save CMake cache files.
- * 
+ *
  */
 class cmCacheManager
 {
@@ -30,7 +30,7 @@ public:
   cmCacheManager(cmake* cm);
   class CacheIterator;
   friend class cmCacheManager::CacheIterator;
-  enum CacheEntryType{ BOOL=0, PATH, FILEPATH, STRING, INTERNAL,STATIC, 
+  enum CacheEntryType{ BOOL=0, PATH, FILEPATH, STRING, INTERNAL,STATIC,
                        UNINITIALIZED };
 
 private:
@@ -57,7 +57,7 @@ public:
     bool IsAtEnd() const;
     void Next();
     const char *GetName() const {
-      return this->Position->first.c_str(); } 
+      return this->Position->first.c_str(); }
     const char* GetProperty(const char*) const ;
     bool GetPropertyAsBool(const char*) const ;
     bool PropertyExists(const char*) const;
@@ -76,7 +76,7 @@ public:
     CacheIterator(cmCacheManager &cm) : Container(cm) {
       this->Begin();
     }
-    CacheIterator(cmCacheManager &cm, const char* key) : Container(cm) 
+    CacheIterator(cmCacheManager &cm, const char* key) : Container(cm)
       {
       if ( key )
         {
@@ -87,30 +87,30 @@ public:
     CacheEntry const& GetEntry() const { return this->Position->second; }
     CacheEntry& GetEntry() { return this->Position->second; }
   };
-  
+
   ///! return an iterator to iterate through the cache map
-  cmCacheManager::CacheIterator NewIterator() 
+  cmCacheManager::CacheIterator NewIterator()
     {
       return CacheIterator(*this);
-    } 
-  
+    }
+
   /**
    * Types for the cache entries.  These are useful as
    * hints for a cache editor program.  Path should bring
-   * up a file chooser, BOOL a check box, and STRING a 
+   * up a file chooser, BOOL a check box, and STRING a
    * text entry box, FILEPATH is a full path to a file which
    * can be different than just a path input
    */
   static CacheEntryType StringToType(const char*);
   static const char* TypeToString(CacheEntryType);
   static bool IsType(const char*);
-  
+
   ///! Load a cache for given makefile.  Loads from ouput home.
-  bool LoadCache(cmMakefile*); 
+  bool LoadCache(cmMakefile*);
   ///! Load a cache for given makefile.  Loads from path/CMakeCache.txt.
   bool LoadCache(const char* path);
   bool LoadCache(const char* path, bool internal);
-  bool LoadCache(const char* path, bool internal, 
+  bool LoadCache(const char* path, bool internal,
                  std::set<cmStdString>& excludes,
                  std::set<cmStdString>& includes);
 
@@ -124,19 +124,19 @@ public:
 
   ///! Print the cache to a stream
   void PrintCache(std::ostream&) const;
-  
+
   ///! Get the iterator for an entry with a given key.
   cmCacheManager::CacheIterator GetCacheIterator(const char *key=0);
-  
+
   ///! Remove an entry from the cache
   void RemoveCacheEntry(const char* key);
-  
+
   ///! Get the number of entries in the cache
   int GetSize() {
     return static_cast<int>(this->Cache.size()); }
-  
+
   ///! Break up a line like VAR:type="value" into var, type and value
-  static bool ParseEntry(const char* entry, 
+  static bool ParseEntry(const char* entry,
                          std::string& var,
                          std::string& value,
                          CacheEntryType& type);
@@ -154,7 +154,7 @@ public:
 
 protected:
   ///! Add an entry into the cache
-  void AddCacheEntry(const char* key, const char* value, 
+  void AddCacheEntry(const char* key, const char* value,
                      const char* helpString, CacheEntryType type);
 
   ///! Get a cache entry object for a key