Misc. typos

+ some are doxy others are just comment code.  
+ some minor whitespace and grammatical tweaks. 
+ app/SCL/* typos have also been submitted upstream (https://github.com/stepcode/stepcode/pull/366). So it's ok to merge them in to master.

src/Mod/Draft/App/DraftDxf.h

@@ -49,7 +49,7 @@ namespace DraftUtils
     
         // FreeCAD-specific functions
         void AddObject(Part::TopoShape *shape); //Called by OnRead functions to add Part objects
-        std::string Deformat(const char* text); // Removes DXF formating from texts
+        std::string Deformat(const char* text); // Removes DXF formatting from texts
         
     private:
         gp_Pnt makePoint(const double* p);