fix swap_axes mode in plot_log() for log data axis
fix swap_axes mode in plot_log() for log data axis

vlukes/sfepy,vlukes/sfepy,sfepy/sfepy,BubuLK/sfepy,BubuLK/sfepy,rc/sfepy,vlukes/sfepy,sfepy/sfepy,sfepy/sfepy,rc/sfepy,BubuLK/sfepy,rc/sfepy