Inconsistent namespace prefixing for shared_ptr.

Sometimes shared_ptr is written "boost::shared_ptr", sometimes it is written "shared_ptr"

In our organization, we use our own implementation of shared_ptr so we prefer no namespace specification for shared_ptr, or at least a consistent namespace specification.

For example, in gcc 4.3 or later, there're std::shared_ptr provided along with boost::shared_ptr, so if we using both std and boost namespace, the shared_ptr then becomes an ambiguous type unless one explicit specify std::shared_ptr or boost::shared_ptr. Even worse, these two shared_ptr are not compatible with each other, that is, you can not assign std::shared_ptr to boost::shared_ptr and vice versa.
So we need a way to consistently determine which version of shared_ptr to use.

Please consider to modify stdafx.h or pch.h to select shared_ptr by "using std::shared_ptr" or "using boost::shared_ptr". Also remove all "using namespace std" in all headers to avoid ambiguous symbols