resview.py: fix streamline vectors name in pv_plot()
resview.py: fix streamline vectors name in pv_plot()

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