18 tool manuals added

Links to 18 more tool manuals were added recently, for the brands listed below. In addition, this site's Harbor Freight manuals page was updated to include links to the list of tool manuals for each of the Harbor Freight brands listed on this site (with more to come).

Bauer:

   - 1 sander manual

Chicago Electric:

   - 6 saw manuals

   - 1 saw blade installation guide

   - 7 welder manuals

Pittsburgh:

   - 1 crane manual

   - 1 test kit manual

Wen:

   - 1 nailer manual