(1) adding support for FHI-aims modulation output, modulation setting in control.in

(2) adding write_eigenfrequencies_and_eigenvectors_at_gamma (both non-nac and nac)

(3) examples (Si, NaCl) for the above two are added to example/FHI-aims
Merge branch 'master' of github.com:shanghui/phonopy into fhi-aims