dispersion_analysis.py: new --refine option
dispersion_analysis.py: new --refine option

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