Merge from trunk:

1) #warning replaced with #error (refs #7228)
2) Pavel Korzh added to thanks list (refs #7157)
3) BOOST_NOEXCEPT modifiers added where possible
4) better support for c++11 Unicode characters
5) fixed compilation with MSVC+STLPort
6) more agressive usage of Traits template parameter
7) Added lexical_cast(const CharType* chars, std::size_t count) function overload (refs #6430 and refs #6663)
8) Fixed GCC warning in numeric_cast_test.cpp
9) Fix compilation of lexical cast with MSVC 2003 (refs #7255)

[SVN r80409]

numeric_cast_test.cpp

@@ -28,7 +28,7 @@ using namespace boost;
 using std::cout;
 
 
-int test_main( int argc, char * argv[] )
+int test_main( int , char * [] )
 {
 
 #   ifdef NDEBUG
@@ -96,5 +96,6 @@ int test_main( int argc, char * argv[] )
         { cout<<"caught bad_numeric_cast #5\n"; caught_exception = true; }
     BOOST_CHECK ( caught_exception );
 
+    (void)ul; // Supressing GCC warning about set but unused wariable
     return 0 ;
 }