sed: delete a line and there goes the neighborhood at least for i and a

[Dan Jacobson]

Sorry.  We've been thru this before, but I still find it so illogical
that any line barely near a line that has been deleted is then
unusable thru the rest of the sed program.

script contents ----:
sed '
1d
1a\
hello
'<<!
1
2
3
!
result ----:
2
3
script contents ----:
sed '
1d
0a\
hello
'<<!
1
2
3
!
result ----:
2
3
script contents ----:
sed '
1d
0i\
hello
'<<!
1
2
3
!
result ----:
2
3

GNU sed version 3.02
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