set up basic structure
implemented most of the equivalence classes for resulting elements of collapsed nodes
generalised quad/tet creation
renamed coplanar() to isCoplanar()
finished possible deformations for all element types
added subdivision of elements if they are not planar
remove dummy.cpp
added tests and cleaned up main
added method for returning number of collapsable nodes
replaced a few for loops with iterators
Revert "Bumped minimum Boost version to 1.48.0."

This reverts commit 126aec3d3c30327ab5c8e98459d3667cf3b6418d.
This fixes #346.
added necessary includes
[GeoLib] Polygon: Make code more readable.
[GeoLib] Test to check if a point is in polygon.
[GeoLib] Activate Polyline test.
[GeoLib] Tests for GeoLib::lineSegmentIntersect().
[GeoLib] Check if two 3d vectors are parallel.
[GeoLib] GeoLib::lineSegmentIntersect(): new impl.
[GeoLib] lineSegmentIntersect: Reuse value.
[GeoLib] Tests for GeoLib::checkParallelism().