Ehn mp map

Some few improvements:

- creation of a specific file for multiprocessing in misc
- use of map_async function
- look for the default args of fit in specific eelsmodel, edsmodel
Why not have a default for parallel? If it's 1 or 2, should not have any problems with any computers + it's possible to call the function without any arguments, e.g. when you have the ipython kernels created, and know that all of them will be used, you don't want to type useless number. Alternatively, you can change line with another comment and actually use only the specified number of ipython kernels