fix doc related to #478
For Matlab >= 2013a on osx, use renamed SDKROOT macro, MW_SDKROOT
Copy the generated time series in a dseries object (called Simulated_time_series) in the Base workspace (extended_path).
Bug fix. Force axis tight in @dseries/plot method (otherwise the method crashes if Matlab/octave considers a too large x-abscissa).
Cosmetic changes. Removed useless spaces and semicolons.
Same as commit #52a5262b7bbeb0a47961be42d8fba4845ead31cc for the simul command.
Removed old version of homotopic_steps (extended path).
Fixed typo.
Do not systematically throw an errror message if the parameters in the provided mode_file does not exactly match the set of estimated parameters.

If some parameters are missing in the provided mode_file and if mode_compute>0, use the prior mean as an initial condition.
Merge pull request #561 from rattoma/master

Fixed bugs and continue GSA plots harmonization
fix typo