gen_gallery.py: set screenshot size to (800, 600) in resview_plot()
gen_gallery.py: set screenshot size to (800, 600) in resview_plot()

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