use argparse instead of optparse in examples/linear_elasticity/its2D_interactive.py
use argparse instead of optparse in examples/linear_elasticity/its2D_interactive.py

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