- CACHED_CONTAINER::GetVertices: removed useless and unused function
   which does nothing but tainted the API
 - SHAPE_LINE_CHAIN::Collide( const BOX2I& aBox, int aClearance ):
   removed an outdated function with assert(false)
 - SHAPE::BBox(): fix a small typo in the doc string

geometry: IsSolid() and Move() methods, segment overlap detection, some improvements in SHAPE_LINE_CHAIN class.

Fix many doxygen warnings (due to missing info, old comments, typo ...) when building the doxygen doc.

[MacOSX] Fix for name collision with OSX headers, Maciej, Tomasz or others feel free to rework if you want/like

Fixes the case, when waste is never greater then the worst case and seeds assignment does not occur.

template<> -> template <>
Some more reformatting according to uncrustify results.