dispersion_analysis.py: new --mesh-size, --unit-multipliers options
dispersion_analysis.py: new --mesh-size, --unit-multipliers options

- mesh and parameter scaling

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