Added dot product function to SparseVector
Added lengthSquared method for SparseVector and missing const modifiers
Added SparseVector dot product tests
Fixed MatrixBuilder, added methods for retrieving the constructed matrix
Added ART solver and some basic tests for it
Fixed node range clamping
Better tracing test
More fixes for raytracing test
Fixed ART, implemented SIRT
Raytracing test moved to Release target
Added "Tests" build target
Fixed negative values
Added boundaries check