* mln/core/concept/gdpoint.hh,
	* mln/core/concept/gpoint.hh: make to_vec return a new object.

	* mln/core/dpoint.hh,
	* mln/core/point.hh: make to_vec return a vector of float with
	coordinates ordered as a user would expect, (x,y,z...).

	* mln/fun/x2v/bilinear.hh,
	* mln/fun/x2v/trilinear.hh: get the coordinates in the proper vector
	index.

	* mln/fun/x2x/rotation.hh: normalize the axis.

	* tests/algebra/h_vec.cc,
	* tests/core/alias/dpoint3d.cc,
	* tests/core/alias/point1d.cc: fix tests according these changes.

git-svn-id: https://svn.lrde.epita.fr/svn/oln/trunk@3404 4aad255d-cdde-0310-9447-f3009e2ae8c0