Pymathrix

- Added the set_rows(), set_cols(), and set_dim() functions which can be used to modify the number of rows or/and column of a matrix
- Added the determinant() function which calculates the determinant of a matrix (only for 2x2 and 3x3 matrices)

- Improved the error handling and messages
- Improved the assign() function, now it can take a single dimension list or a single numeric value as an argument: assign(2) - assign([1, -6, 5.2])
- Added the from_row() and from_col() functions which return the row or column of a matrix as a matrix object
- Added the hadamard_prod() function which performs the hadamard product of two matrices, it can also be used to multiply a matrix by a numeric value

- Added the subtract function (ability to subtract a matrix from another)

- Bug fix (importing bug)

- Bug fix (assign() function)

- First Release