- default implementation throws,
  - implemented in InterpolatedPath, PathVector, ReedsAndSheppPath,
    StraightPath, ExtractedPath.
  - does not take into account contraints.

  - when extracting an interval the upper bound of which is the same as the
    initial path upper bound, there was a bug if the last path of the vector
    did not start at 0.

  - createCopy and concatenate was taking a const ref to another shared pointer,
  - createCopy prototype has been modified,
  - concatenate has been duplicated, old prototype is deprecated.

  - for path types that do not overload method extract, rounding error may
    appear in the computation of intervals. This commits is aimed at fixing
    an assert that happens when running the random shortcut method on Reeds and
    Shepp paths.

  Paths stored in a path vector are implicitely subject to the constraints of
  the path vector. The getter pathAtRank now reflects this by copying the
  constraints of the path vector in the path returned.

  If both the PathVector and the path at given rank are subject to constraints,
  an exception is raised.

Joseph Mirabel authored Nov 27, 2014 and Joseph Mirabel committed Jan 05, 2015

Conflicts:

	include/hpp/core/straight-path.hh
	src/straight-path.cc

  As Path output are configurations, the size of Path velocities is different
  from the size of Path output.

  - use c-style comment for latex equation including "\\"
  - remove unused function.

  Length of path was updated twice.

  cut dependency to kitelab and jrl-dynamics,
  implement roadmap, problem, path planner...