[boost] possible conflict with new mpl

Hi, After merging the new MPL version, an error popped out in vc7 tests of string_algo lib. http://tinyurl.com/3t6zc It seems that std::distance is conflicting with something else. I'm using both "using namespace std;" and "using namespace boost;" in the tests. This problem do not appear with other compilers. I can possibly fix it with the explicit qualification, but it may just hide some other problem. Any suggestions? Regards, Pavol