updating scaling plots. added pool closing and joining at the end of the MP part because on astro2 I suddenly got the error of having too many open files

fixing errors: hdf5 file creation when there are no settings. and the setting export if there is a functio in it

updated scaling plots and function to compare the grid runs. i need to keep in mind that these calculations are very probably limited the the physical amount of cores the machine has

added some plots, restructured routine for scalingplots, fixing the phasevol part of the grid generator