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IMDISP update

I've made a few changes to IMDISP which are worthy of public release
(IMDISP is an advanced replacement for the built-in TV and TVSCL image
display procedures):

- Added AXIS keyword for X/Y axis overlay (accepts PLOT keywords if AXIS
is set), 
- Added BACKGROUND keyword to allow background color to be set, 
- Added ERASE keyword to allow screen erase before image is displayed, 
- Modified re-gridding algorithm to match Craig Markwardt CMCONGRID
method, 
- Checks for IDL 5.2 when PRINTER device is selected, 
- Changed output scaling range for TrueColor images to 0-255 (was
0-254).

IMDISP version 1.42 source code may be downloaded from
http://cimss.ssec.wisc.edu/~gumley/imdisp.html

Cheers,
Liam.
http://cimss.ssec.wisc.edu/~gumley