A scalebar TRANSPARENT parameter does not work

[tokr@…]

A scalebar TRANSPARENT parameter is ignored and the scalebar background 
transparency is driven by the TRANSPARENT parameter for a whole map.

[fwarmerdam]

Steve,

I believe this is probably broken by my outputFormatObj changes, so I will take
it.  Let me know if you want it back!

[fwarmerdam]

I stand corrected ... I see this is a problem with MapServer 3.6.  Returning
to Steve.  Tomas, would it be possible to attach a simple example demonstrating
the problem?  I would like to add a testsuite check for this in 3.7.

[tokr@…]

SCALEBAR transparent parameter test

[fwarmerdam]

I would like to note that this bug also existed in 3.7, and I have fixed it 
there.  However, I believe the code implementations for creating the image
are fairly different between the two version in msDrawScalebar() because I
introduced use of outputFormatObj and actually used an imageObj for scalebars. 

[sdlime]

I'm thinking that this is not work going back to 3.6 for a fix although it 
sounds pretty trivial (use map->scalbar.transparent instead of map->transparent 
correct?). I could be convinced otherwise though.

[dmorissette]

Since we are unlikely to release another 3.6.x version and this was fixed in 
4.0 by Frank, I'll mark this as fixed for 4.0.  Please reopen if that wasn't the 
right thing to do.