this bug's URL: http://intevation.de/rt/webrt?serial_num=4301
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Subject: r.cost: cleanup temp files on abnormal exit; auto-segmentation
[cribbed from closed bug 3514,3741,4244]
r.cost can make lots of big temp files. We should catch ^C etc &
remove them. In about 10 minutes I just made 12gig worth....
also
"top" reports r.cost is using 1948mb ram for a region this big, with
seg=50% and 90k start points. 
going into swap makes me sad.
If I try seg=100% then G_malloc() gives an out of memory error right
at the start, which is nice.
Auto segmentation by 1/2 & retry if G_malloc() gives out of memory error?
Hamish
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