Re: @subentry, @seealso and @seenentry better formatted in HTML

[Gavin Smith]

> The letter column allows to have the index entries aligned on the widest
> letter.  Also having the letter not with a colspan allows to have only
> one column for the letter line, which gives an easy to follow structure
> when there are borders or coloring of the cells.  There is a downside,
> though, there are empty cells on the letter column for all the index
> entries.  But it does not look that bad to me.  Another downside, of
> course is that there is no possibility to use CSS to remove the empty
> letter column.  However, with CSS, the effect is not the same as the
> indentation is one number, not something lin line with the actual width
> of the letters.

It doesn't seem necessary to change this even if there are other
possibilities.  It seems like a different issue to the implementation
of multi-level indices in the HTML output.