Fixed incorrect calculation of the min distance limit for arithmetic tests.
Moved some of the arithmetic tests to a separate function because
otherwise MSVC-10 for x64 generated broken code (the code would use
garbage values in registers to pass arguments to
add_and_test/sub_and_test).
Added output operators and employed newer test macros that output compared
values in case of test failure.
1. Expose value_type and difference_type (where present) to user's code.
2. Prohibit arithmetic operations on pointers to non-object types. In
particular, arithmetic operations such as fetch_add/fetch_sub will no longer
compile for pointers to cv void, pointers to functions and pointers to
non-static class members.
Also, use C++11 <type_traits> when possible instead of Boost.TypeTraits to
reduce dependencies. Cleaned up value_arg_type internal type usage for more
efficient argument passing.
