error message improvements

[Dan Jacobson]

Regarding such error messages:

echo 0298284|postofficechecksum 
/home/jidanni/bin/postofficechecksum: line 6: unexpected EOF while looking for 
matching `"'
/home/jidanni/bin/postofficechecksum: line 25: syntax error: unexpected end of 
file

1. it isn't clear enough that it's bash doing the complaining, and not
   one of the 13,000 other things I've got in there.  Perhaps prefix a
   "bash:".

2. With a minor adjustment, we could jump to the line of the error in
   emacs' compile mode:
/home/jidanni/bin/postofficechecksum:6: unexpected EOF while looking for 
matching `"'
/home/jidanni/bin/postofficechecksum:25: syntax error: unexpected end of file
Should there be an "--adhere to emacs' [less clear but usable inside
   emacs] error message standard" option... or perhaps picky me can
   write a filter for personal use. 

3. If you go the emacs way then you might as well go whole hog with
   e.g. 25:34 to move to character position 34 on line 25, as emacs can handle 
it.
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