new Functions and fixes in matrix.js

Matrix.js
- fromString is now static and creates a new matrix
- addRowToRow
- addColumnToRow
- createCopy of matrix
- swapRows, swapColumns
- doGaus use now a new matrix
- doGausPivot (Prototyp, not workin)
- calcDeterminant (calcs the determinant. current Max 3x3)