10 more chain saw manuals added

10 more chain saw manuals and parts lists have been added recently:

- Craftsman: 1 chain saw manual, 1 chain saw parts list
- Husqvarna: 3 chain saw manuals, 1 chain saw parts list
- McCulloch: 1 chain saw parts list
- Poulan: 1 chain saw parts list
- Poulan Pro: 1 chain saw parts list
- Stihl: 1 chain saw parts list