update .gitignore
add example for FMA analysis
add old function plot_ap to aperture.py
fix bug in getmn() and add sum and difference resonances, add plotting of resonance sidebands
get_tol extracts the aperture tolerances for a given element, analysis_tol.py is an example
plot_dares.py defines functions to plot dynamic aperture
clean up getmn in optics.py and footprint.py
Merge remote-tracking branch 'riccardo/master' into mric
Merge pull request #1 from mfittere/master

Merged my version with yours, updated footprint.py
To be check errors_getnm removed from optics class