fixed issue #56: exponent-labels were 0 below ~1e-16 ... reason was using <std::numeric_limits<double>::epsilon() instead of <std::numeric_limits<double>::min() for checking close to zero
fixed issue #56: exponent-labels were 0 below ~1e-16 ... reason was using <std::numeric_limits<double>::epsilon() instead of <std::numeric_limits<double>::min() for checking close to zero

jkriege2/JKQtPlotter,jkriege2/JKQtPlotter,jkriege2/JKQtPlotter