Make Terminal::Framebuffer::Rows shared and copy-on-write.

* Support both std:: and std::tr1:: shared_ptr. FreeBSD 10 now uses C++11 by default.
* Remove Framebuffer pointers in STMClient

configure.ac

@@ -206,6 +206,9 @@ AC_CHECK_HEADERS([endian.h sys/endian.h])
 AC_CHECK_HEADERS([utmpx.h])
 AC_CHECK_HEADERS([termio.h])
 AC_CHECK_HEADERS([sys/uio.h])
+AC_LANG_PUSH(C++)
+AC_CHECK_HEADERS([tr1/memory])
+AC_LANG_POP(C++)
 
 # Checks for typedefs, structures, and compiler characteristics.
 AC_HEADER_STDBOOL
@@ -371,6 +374,32 @@ public:
   [AC_MSG_RESULT([no])])
 AC_LANG_POP(C++)
 
+AC_MSG_CHECKING([whether std::shared_ptr is available])
+AC_LANG_PUSH(C++)
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <memory>
+class T {
+public:
+  std::shared_ptr<int> Fun( void ) { return std::shared_ptr<int>( new int ( 0 ) ); } };]],
+[[T x; return !!x.Fun();]])],
+  [AC_DEFINE([HAVE_STD_SHARED_PTR], [1],
+     [Define if std::shared_ptr is available.])
+   AC_MSG_RESULT([yes])],
+  [AC_MSG_RESULT([no])])
+AC_LANG_POP(C++)
+
+AC_MSG_CHECKING([whether std::tr1::shared_ptr is available])
+AC_LANG_PUSH(C++)
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <tr1/memory>
+class T {
+public:
+  std::tr1::shared_ptr<int> Fun( void ) { return std::tr1::shared_ptr<int>( new int ( 0 ) ); } };]],
+[[T x; return !!x.Fun();]])],
+  [AC_DEFINE([HAVE_STD_TR1_SHARED_PTR], [1],
+     [Define if std::tr1::shared_ptr is available.])
+   AC_MSG_RESULT([yes])],
+  [AC_MSG_RESULT([no])])
+AC_LANG_POP(C++)
+
 AC_CHECK_DECLS([__builtin_bswap64, __builtin_ctz])
 
 AC_CHECK_DECL([mach_absolute_time],