dispersion_analysis.py: remove _le suffix from problem-dependent functions
dispersion_analysis.py: remove _le suffix from problem-dependent functions

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