| #### D.12.2.4 Cornacchia Procedure from library `atkins.lib` (see atkins_lib). Usage: Cornacchia(d,p); Return: x,y such that x^2+d*y^2=p with p prime, -1, if the Diophantine equation has no solution, 0, if the parameters are wrong selected Assume: 0<d<p Example:
    LIB "atkins.lib";
    Cornacchia(55,9551);
    ==> [1]:
    ==>    16
    ==> [2]:
    ==>    13

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