std::auto_ptr is deprecated

[madebr]

std::auto_ptr is deprecated.

Compiling libiqxmlrpc as a c++98 makes the deprecation warnings go away.

But applications using c++11 (or newer) and libiqxmlrpc will have these warnings appear.

[rriggs]

In general it would be nice to have this library updated to C++11 (at least). That likely eliminates the Boost dependency.

[adedov]

Hi, I gladly accept PR-s. Thanks