WP 34S and 31S bugs and fixes

[Pascal]

Hi.

First let me thank and congratulate the whole team that has made the WP 34S and 31S possible!

Could one of the developers have a look at the Solve algorithm? If one tries to solve f.i. \(x^2-5x+6=0\) with initial estimates 0 and 1, the computed new estimates (shown with a PSE 10 just after the LBL) are weird values, and the algorithm stops with an "+Infinity error". The quadratic interpolation seems to be broken, when two consecutive estimates give function values with the same sign. I think, in the corresponding source code the 8th line of part "slv_quadratic" should read RCL XB and not RCL FXB, but I may be wrong. The developer of this algorithm surely knows where to look.

Best regards,
Pascal