implemente a new sqrt() function, due to some bugs in the math libra…#17

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giacomoleonzi wants to merge 1 commit intoopenenergymonitor:masterfrom giacomoleonzi:Emonlib_Esp8266

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Commits on Jul 22, 2015

implemente a new sqrt() function, due to some bugs in the math library in the C/C++ toolchain
giacomoleonzi
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