Pep8 + function addition.
Added class for Newton Fractal, basic class. Bug in identifying the points.
Added iteration function for the newton fractal and differential of the basic function (to be removed once set to differenciate symbolicly).
Added Newton's GUI and tab to the main window. Polishing needed.
Solved loop issue, now displays properly the fractal.
Changed newtoniter function to make use of the poly1d class, and added function to transform user input into an array of numbers.
Minor changes to use poly1d class to enter the polynomial.
Added future division
Corrected label on Newton's tab and better colour palletes.
Solved errors concerning log trying to evaluate on 0, mainly seen when higher order functions were used.
Considerable optimizations in Newton fractal regarding speed, shaving 5 seconds off.
Info popup change, soon to be all merged into a single information tab or menu option.
Merge branch 'feature/newtonfractal' into develop