[Groff] Tables in .ig/.. blocks not ignored

[Larry Kollar]

Tables that *should* be commented out using the .ig / .. construct still 
appear in the output. I first noticed this in 1.19.2, but it also appears in 
the 
CVS.

Here's an example file:

.\" ---------------- start ------------------
.LP
The following table should be seen:
.TS
allbox;
cb cb
n l .
Value   Description
1       enable line 1
2       enable line 2
3       enable both lines
.TE
.LP
But this table should
.I not
be seen:
.ig
.TS
allbox;
cb cb
n l .
Value   Description
0       Disable all lines.
1       Enable line 1.
2       Enable line 2.
4       Enable line 3.
8       Enable line 4.
.TE
..
.LP
And that's all.
.\" ---------------- end ------------------

-- Larry