fix write flag in update_supported_formats() for variants (WIP)
fix write flag in update_supported_formats() for variants (WIP)

- meshio does not know our variants - some translation is needed

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