STYLE: add notes where files are added into global/globals.C

ENH: use dictionary findDict() directly for debugSwitches

- the isDict() method is just a wrapper around the pointer anyhow

src/OpenFOAM/db/error/IOerror.C

@@ -24,6 +24,9 @@ License
     You should have received a copy of the GNU General Public License
     along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
+Note
+    Included by global/globals.C
+
 \*---------------------------------------------------------------------------*/
 
 #include "error.H"