Sparse/Abstracted Linear Solvers Includes CPU and GPU version of conjugate gradient, conjugate residual, GMRES, and JFNK. Dependencies: https://github.com/thenumbernine/lua-ext OpenCL-based solvers depend on https://github.com/thenumbernine/lua-opencl The tests also use: https://github.com/thenumbernine/vec-lua https://github.com/thenumbernine/lua-matrix https://github.com/thenumbernine/lua-gnuplot