relate_linear_areal:
handle non-endpoint x-c turns pair generated for a collinear spike.
relate/follow helpers:
fix turn_on_the_same_ip to use fraction instead of dimension.
get_turns:
L/L and L/A - use base_turn_handler::assign_point() to set fractions properly for collinear-opposite spikes.
L/A - fix the condition in calculate_spike_operation() used to check if a spike goes into the interior or exterior.
The intention is to prevent creation of too big files in MinGW.
Move predefined Geometries for relops from test_relate.hpp to predef_relop.hpp
Move test_geometry<> defined in relate.cpp to test_relate.hpp
