The base calculate(), grid_search() and minimise() methods now all accept the scaling_matrix
argument, and the minimise() scaling argument has been removed. This scaling_matrix argument should
be a per-model list of scaling matrices.
To handle the change, the pipe_control.minimise.assemble_scaling_matrix() function has been created.
This uses the new parameter object scaling values to create the list of scaling matrices. This will
in the end replace all of the analysis specific assemble_scaling_matrix() functions and simplify
their optimisation code paths.
