Static analyzer feedback on library for interested in.

I ran PVS Studio analyzer on boost/geometry and get some interesting points on library code:
```
/boost/geometry/include/boost/geometry/policies/relate/direction.hpp 184 err V583 The '?:' operator, regardless of its conditional expression, always returns one and the same value: -1.
/boost/geometry/include/boost/geometry/formulas/karney_inverse.hpp 373 err V547 Expression 'iteration < max_iterations' is always true.
/boost/geometry/include/boost/geometry/algorithms/detail/overlay/get_turn_info_la.hpp 426 warn V560 A part of conditional expression is always false: pk_q1 > 0.
/boost/geometry/include/boost/geometry/algorithms/detail/overlay/get_turn_info_la.hpp 437 warn V560 A part of conditional expression is always false: pk_q1 < 0.
/boost/geometry/include/boost/geometry/algorithms/detail/within/multi_point.hpp 154 warn V547 Expression 'in_val >= 0' is always true.
/boost/geometry/include/boost/geometry/algorithms/detail/relate/areal_areal.hpp 233 warn V649 There are two 'if' statements with identical conditional expressions. The first 'if' statement contains function return. This means that the second 'if' statement is senseless. Check lines: 220, 233.
/boost/geometry/include/boost/geometry/algorithms/detail/relate/linear_areal.hpp 383 warn V649 There are two 'if' statements with identical conditional expressions. The first 'if' statement contains function return. This means that the second 'if' statement is senseless. Check lines: 371, 383.
/boost/geometry/include/boost/geometry/algorithms/detail/relate/linear_areal.hpp 420 warn V649 There are two 'if' statements with identical conditional expressions. The first 'if' statement contains function return. This means that the second 'if' statement is senseless. Check lines: 407, 420.
/boost/geometry/include/boost/geometry/algorithms/detail/relate/linear_linear.hpp 158 warn V649 There are two 'if' statements with identical conditional expressions. The first 'if' statement contains function return. This means that the second 'if' statement is senseless. Check lines: 139, 158.
/boost/geometry/include/boost/geometry/algorithms/detail/overlay/assign_parents.hpp 316 warn V560 A part of conditional expression is always true: !is_dissolve.
/boost/geometry/include/boost/geometry/algorithms/detail/is_simple/linear.hpp 73 err V501 There are identical sub-expressions to the left and to the right of the '||' operator.
/boost/geometry/include/boost/geometry/algorithms/detail/touches/implementation.hpp 176 warn V1037 Two or more case-branches perform the same actions. Check lines: 176, 181
```

Maybe someone would be interested in researching of that cases and will make a fix.