Created originally on Bitbucket by calpe (Miguel Calpe)
Was already merged in Bitbucket before import, marked as merged by the import user
- if coef_group == None, not group velocity into deltat.
- Fixed bug concatenate spatio_temp and times.
- Decrease file_size in test.
- Changes in spatio_temporal_spectra
- --user in Makefile
- Correction bug concatenate + kx_max in plot spatio temporal spectra.
- For tests..