[Development] cmath, abs(), qt5 and gcc6

[Lisandro Damián Nicanor Pérez Meyer]

pebcak, by using cmath code should be using the std namespace.

Sorry for the noise.

-- 
Lisandro Damián Nicanor Pérez Meyer
http://perezmeyer.com.ar/
http://perezmeyer.blogspot.com/
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