[s4] LDB TDB indexes

[Matthias Dieter Wallnöfer]

Hi abartlet!

Andrew Bartlett wrote:
> My main concern is that, unlike my ldb-index branch, this does not make
> any attempt to upgrade the on-disk format.  Without that change, won't
> we get the same kind of errors, reading 'linearized (mixed case)' DNs
> from disk, and then doing strcmp() on them with casefolded DNs?
>    
Obviously this doesn't work with my patch. For sure we'll have to be 
careful how to handle existing indexes and maybe convert them. Since 
this problem is important I would appreciate to hear tridge's comment on 
my thoughts.

I would like to see this fixed soon since broken indexes are very 
problematic.

Matthias