Removing double prefixes bug in produce_or_load

See JuliaDynamics#392

src/saving_files.jl

@@ -80,15 +80,14 @@ function produce_or_load(f::Function, config, path::String = "";
  """
  end
  if filename === nothing
- filename = config -> savename(config; kwargs...)
+ filename = config -> savename(prefix, config, suffix; kwargs...)
  end
  # Prepare absolute file name
  if filename isa AbstractString
- name = filename
+ name = append_prefix_suffix(filename, prefix, suffix)
  else
  name = string(filename(config))
  end
- name = append_prefix_suffix(name, prefix, suffix)
  file = joinpath(path, name)
  # Run the remaining logic on whether to produce or load
  if !force && isfile(file)