+ Add "same link" operator for "VPoint" class. + Fix bug of BFGS transform in "tinycadlib". + Remove test function of Sketch Solve. + Support for multi slider joint.
18.07
+ Limitation format (upper and lower) of "Planar" class has been changed. + PMKS expression classes has been independent to new library. + Copy and comparison method of "VPoint" class. + New detect mechanism in VPoint distance method. + Remove "expr_path" function. + "Sketch Solve" kernel support PMKS expression.
18.06
+ Submodule added. + Add a C++ tiny CAD solver "Sketch Solve" with BFGS algorithm: + Cython wrapper. + Use to make position analysis. + Base class for algorithm verification function object.