run AcousticBandGapsApp from simple.py, new --app option
run AcousticBandGapsApp from simple.py, new --app option

- add phonon.py-specific options with --phonon- prefix
- determine app_mode in main()

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