json-cpp Code

Fixed compilation with Sun Studio 12 (avoid usage of std::distance)

Fixed iteration bug over null values.

Added instruction to run unit tests manually.

Moved jsontestrunner data from test/ to test/data.

- added mini unit testing framework
- added unit tests for Value.isXYZ() and iteration over Value members to compute size

Added support for valgrind memory checks

Fixed compilation issue with vs2005

Fixed documentation example. Bounced version number.

Moved Visual Studio projects file under makefiles/vs71 to allow usage of multiple versions on the same source tree.

- fixed build issue on Solaris (wrong compilation flags for multi-threading)
- fixed build issue on Linux redhat 3: python does not has tarfile module