[geometry] added relate() test implementation for Point-Geometry, Geometry-Point and Linestring-Linestring. The least one is not finished yet.
[geometry] relate code divided into several files
[geometry] added test file for relate(), fixed error in linear_linear, added tag-dispatched detail::relate()
[geometry] fixed some errors in relate(Ls, Ls): checked terminal points of both linestrings, treated touch with x/x as ii
[geometry] handled more cases in relate(Ls, Ls)
[geometry] in relate() called dispatch::get_turns instead of higher level one to avoid geometries switching, added generation of SVGs for some special cases
[geometry] added self-turns output to 1-geometry to_svg()
[geometry] added relate() test
added generation of IP for the first point of a Linestring - c+c/c, c+i/u or c+u/i
[geometry] handled IP for the first point of a LS when IP is equal to the second point of the first segment of the other LS to avoid generation of 2 IPs for the same point
[geometry] handled IP on the last point of LS for equal and collinear case, for the first point method may now be set to equal or collinear
[geometry] begined the new implementation of handling of first and last LS point in get_turns(), for now considered cases when both LSs starts on the same segment
small changes of methods/operations and comments to generation of turns for the first points
added preliminary version of the new algo for the first point of P LS
overlay:: equal<> and collinear<> used to calculate the operations for the first point of P LS in adequate cases
Merge branch 'feature/within' of github.com:mkaravel/geometry into feature/within