gen_gallery.py: update for reorganized scripts
gen_gallery.py: update for reorganized scripts

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