Draw order of DEFAULT layers in WMS

[Shawn Gervais]

Greetings list,

I noticed while playing with DEFAULT layers that they were being drawn 
behind all my other layers. After looking at the code, I found that 
mapwms.c will draw DEFAULT layers before any others, and does not 
respect the draw order that the WMS client provides.

I think this violates the WMS 1.1.1 spec - 01-068r3 7.2.3.3 which states:

"A WMS shall render the requested layers by drawing the leftmost in the 
list bottommost, the next one over that, and so on."

 From the WMS client's perspective, it has no idea what a layer's STATUS is.

I have attached a patch which will respect the draw order for DEFAULT 
layers, if they are specified in the LAYERS parameter. If they are not 
specified, the old behavior is used. I would appreciate feedback, if 
anyone has, on whether this is worthy of submitting as a ticket.

-Shawn
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