Guessing Solver

Using Guesses to solve the Puzzle.
TODO: Improve the solving alghoritim seaching by a number left in a Row/Column/Sector. See YasSS - Yet Another (Simple|Stupid) Sudoku Solver, Section Simple Solve 2.

Simple Solver

Sudoku Solver without Guesses.
If during running all remaining cells were with more two possible values, it will be thrown a error.