Accelerating piecewise linear interpolation deploying a binary interval search.

Testing of the PointVec class.

This was implemented in gcc-4.7.

This should speed up travis builds.

Travis uses Ubuntu 12.04 which ships with Boost 1.46.0. Required
version was lowered therefore.

This will prevent Travis-builds from failing because of the bad
availability of the original git repo.

Fix some warnings exclusive in visual studio.

Remove warnings in TestPolyline.cpp.

Made MatrixBase a base class of (dense) matrix MathLib::Matrix.

Match the signatures of the derived class CRSMatrixReorderedOpenMP::amuxCRS() and the base class CRSMatrix::amuxCRS().

Fixed Windows warning signed/unsigned comparison for OpenMP loop type.

Fixed warning for the type conversion time_t to unsigned int.