Update documentation of flow velocity functions
Add LCS Tool article to references
Merge commit 'c25182d2c5fda2097ff28077e9da88252372d2ad' into lambda_range
Replace flowdata_derivative with derivative

The ocean dataset demo used the function flowdata_derivative. Remove
and replace this function with demo/ocean_dataset/derivative. This
makes the ocean dataset demo more similar to the other demos.
Improve error message on required MATLAB version in seed_curves_from_lambda_max
Update seed_curves_from_lambda_max documentation
Replace addParamValue → addParameter
Update documentation