Passing a model to an `Analysis` leads to a crash in Matlab.

[nickbianco]

Reported by a user on the forum: passing a model to an Analysis can lead to a crash in Matlab. This user was trying to use the API to construct setup files for the AnalyzeTool.

Part of the issue might be that if you pass a model to the constructor of an Analysis, it should also be added to the model, e.g.,

MuscleAnalysis* muscleAnalysis = new MuscleAnalysis(&model);
model.addAnalysis(muscleAnalysis);

If so, this is not very clear from the API nor the documentation.