[boost] Exception lib proposal update: exception_info name collision

Hello, I forgot to mention that windows.h defines a macro called exception_info which causes obscure compile errors with the proposed boost exception library (http://www.revergestudios.com/boost-exception/boost-exception.htm). My own solution to this issue was to #undef exception_info after including windows.h, but I realize that the easiest solution to this problem is to rename the exception_info function in the exception lib. I'm thinking of renaming it to xinfo but I'd like to consider other ideas as well. Thanks, Emil Dotchevski