[doc] Added Samuel and fixed some doc issues for distance
[get_turns][relate][test][index] Fix unused variable warnings.

In the rtree/pack_create replace (void)variable to boost::ignore_unused_variable_warning().
[extensions][dissolve] repaired dissolve w.r.t. turn changes
[extensions][dissolve] added extra unit tests for cw/ccw check
Merge branch 'develop' of github.com:boostorg/geometry into develop
[overlay][relate][within][test] Fix unused variable warnings.
Merge branch 'develop' of github.com:boostorg/geometry into develop
[index/example] Add the visualization of knn Box/Box and Seg/Box to glut_vis example
[doc][example] Update the knn queries section in docs. Improve knn query visualization in glut_vis.
[doc] Fix quickref.xml to support new parameter name of nearest(). Also improve the knn examples info.
Merge pull request #32 from mkaravel/develop

Develop
[distance] fix bug in point-box distance computation in range-to-segment/box code