dispersion_analysis.py: new --mode option, new wave number computaion mode
dispersion_analysis.py: new --mode option, new wave number computaion mode

- rename --wave-range option to --range
- change log names

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