MatthewHeun/matsindf: v0.4.0

matsindf 0.4.0 (2023-03-07) All functions now work with both matrix and Matrix objects, thereby enabling use of sparse matrices. Use matsbyname::Matrix() to create sparse matrices as appropriate. mat_to_rowcolval() now accepts Matrix objects in the .matrix argument. rowcolval_to_mat() gains a matrix.class argument that specifies whether a matrix or a Matrix should be created. Many new tests to verify that the package works with Matrix objects. Now at 323 tests, all passing. Test coverage remains at 100 %