New keyshades & keylines & keymarker commands

GIS Students:

I've finally found (or rather written) a workaround for centering the text
beside the legend boxes.  I wrote three AMLs called KS.AML, KM.AML and
KL.AML that you can use as replacements for KEYSHADE and KEYLINE.  That
is, once you've created your key text files you'd use: 

ks bozo.key
km bozo.key
or 
kl bozo.key

where bozo.key is the name of your key text file.  You can also use it 
with INFO LUTs (see LUTasKEY).  In fact any other 
parameters you would send to keyshade, etc., are simply passed along to 
those commands -- my AMLs simply tweak the settings to work better.

As with the regular commands, you should first set the sizes of your
boxes, with KEYBOX (use zero for Y if you're doing line symbols), set your
textfont and textsize, and other variables like KEYSEPARATION and KEYPOS,
then use ks or kl instead of keyshade or keyline. 

Good luck.  Please let me know if you discover any bugs.