Improve default label placement for "POSITION auto"

[olt]

With POSITION auto, MapServer tries to place each label at different positions until if finds enough free space. It starts with UL (upper/left) even if there is space for UC (upper/center) which would look much better IMO.

I changed the order to the following and the results are much better, again IMO. Line 2578 in mapdraw.c

positions[0]=MS_UC; positions[1]=MS_LC; positions[2]=MS_UR; positions[3]=MS_CR; positions[4]=MS_LR; positions[5]=MS_UL; positions[6]=MS_CL; positions[7]=MS_LL;

See attached images.

[tbonfort]

duplicates #4242

[olt]

Oh, my fault. I searched for "placement" and not "position" when I checked for similar tickets.