[Ipopt] bug in computing average values in EquilibrationScaling

[victor.zverovich at gmail.com]

Hi,

There is a bug in computing avrg_values in Ipopt at
https://projects.coin-or.org/Ipopt/browser/trunk/Ipopt/src/Algorithm/IpEquilibrationScaling.cpp#L135and
two similar cases below. Instead of

  avrg_values[i] =+ fabs(val_buffer[i]);

there should be

  avrg_values[i] += fabs(val_buffer[i]);

Otherwise the value is simply overwritten every time.

The attached patch fixes the bug.

Best regards,
Victor
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