Add a flag for calib_smoother command and apply a setup similar to the one used for stoch_simul command:
- Add auxiliary variables for leaded and lagged exogenous
- Set the cutoff applied to the Jacobian at zero for the static and the dynamic models
Corrects a bug in the way to test for the presence of the global variables
Comment the trend test for a balance growth path => problematic with eLogTrend
Merge pull request #510 from FerhatMihoubi/master

Various fixes by Ferhat