Log Message:
Changes 2.3.5:
- Documentation fixes for libraries.xml and
  builders-writing.xml
- Extended docs for InstallVersionedLib/SharedLibrary,
  and added SKIP_WIN_PACKAGES argument to build script
  bootstrap.py
- Fixed symlink support
- Updated debug-count test case
- Fixed incomplete LIBS flattening and substitution in
  Program scanner
- Added new method rentry_exists_on_disk to Node.FS
- Fixed several D tests under the different OS.
- Add support for f08 file extensions for Fortran 2008 code.
- Show --config choices if no argument is specified
- Fixed build crash when XML toolchain isn't installed, and
  activated compression for ZIP archives.
- Fix for VersionedSharedLibrary under 'sunos' platform.
- Fixed dll link with precompiled headers on MSVC 2012
- Added an 'exclude' parameter to Glob()
- Support for multiple cmdargs (one per variant) in VS project files.
- Various improvements for TempFileMunge class.
- Added an implementation for Visual Studio users files
- Added support for the 'PlatformToolset' tag in VS project files
- Added support for '-isystem' to ParseFlags.