Update matrix_op and matrix_rw, change 2D array indexing

Update examples, tests, README.md

Use Kahan summation algorithm in the integrator step

Update README.md

Update dependencies

Increment version number

Update CMakeLists.txt

Merge branch 'main' of https://github.com/cinaral/rk4_solver

Merge branch 'main' of https://github.com/cinaral/rk4_solver

Update to new matrix_op v1.0.3