gegl/operation, operations: adapt to previous commit
Rename gegl_operation_get_min_threaded_sub_size() to gegl_operation_get_pixels_per_thread(). This function returns the (very hypothetical, ATM) cost of using each additional thread for processing the operation, realtive to the cost of processing a single pixel. As before, it simply returns 64 * 64 for now. This function is meant to be used for the thread_cost parameter of gegl_parallel_distribute_area(). Use the new function in the auto-threaded operation classes, and in manually-threaded operations using gegl_parallel_distribute_area(). Additionally, use the function in manually-threaded operations using gegl_parallel_distribute_range(), by dividing its result by the relevant dimension of the processed area.
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