Rename the C++HL library to SVN++, renaming files, namespaces and directories.
* Makefile.in (SVNXX_INCLUDES): Renamed and changed from CXXHL_INCLUDES. (COMPILE_SVNXX_CXX): Renamed and changed from COMPILE_CXXHL_CXX. * build.conf (options.private-includes): Update C++ bindings' header paths. (libsvnxx): Rename and update target from libsvncxxhl. * build/generator/gen_make.py (Generator.write): Use 'svnxx-' instead of 'cxxhl-' for extra-install check. * build/generator/gen_win.py (WinGeneratorBase.get_win_includes): Check for 'svnxx', not 'cxxhl'.
* subversion/bindings/cxx/: Renamed from .../bindings/cxxhl/. * subversion/bindings/cxx/include/svnxx/: Renamed from .../include/svncxxhl/. * subversion/bindings/cxx/include/svnxx.hpp: Renamed from .../include/svncxxhl.hpp. * subversion/bindings/cxx/**: Rename namespaces, include paths and guards.