incorrect free memory

[thuliu-yt16]

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Putting multiple array pointers in a single delete[] line is incorrect. E.g., in base_solver.h: https://github.com/Trinkle23897/Fast-Poisson-Image-Editing/blob/6a607f17e335a8be97cbfe39dd9b2de6de2a7cb6/fpie/core/base_solver.h#L28 and https://github.com/Trinkle23897/Fast-Poisson-Image-Editing/blob/6a607f17e335a8be97cbfe39dd9b2de6de2a7cb6/fpie/core/base_solver.h#L98 They lead to memory leaks.

Instead, they should be

    delete[]  A;
    delete[]  B;
    delete[]  X;

and

    delete[]  mask;
    delete[]  tgt;
    delete[]  grad;