[STUMP] stumpish changes for non-GNU systems

[Anonymous]

While porting the script to FreeBSD I've made a few changes.
Can someone test them on non-ancient Linux?

I've myself tested only on

  GNU sed 4.2.1[1]
  GNU sleep 7.5
  bash 4.1.7
  dash 0.5.6[2]
  rlwrap 0.36

without installing real Linux system. So, I'm not sure how well
e.g. termcap solution will work there.

[1] compatible with -E option
[2] bultin echo there prints both \102 and \0102 as B

patch-contrib-stumpish
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