Debug message inserted into html from mapdraw.c

[bfraser@…]

At line 360 in mapdraw.c there's a call to msDebug:

        msDebug( "scalefactor = %g\n", map->layers[i].scalefactor );

but it's not protected  with a "if (map->layers[i].debug)" or something
similar.

If the sizeunits are not PIXEL, all mapserver generated webpages will 
have "scalefactor = nnnn" shown at the bottom of the page.