revision tracking patches round 4

[David Bremner]

Tomi Ollila <tomi.ollila at iki.fi> writes:

>
> Looked a bit to xapian documentation... it seems in case of compacting
> one should do the following:
>
> 1) see that current database uuid is the one expected (which is stored
> somewhere) 
> 2) compact database
> 3) read new uuid and store it to "somewhere"

right, I think this is basically right. It falls under the same general
lazy objections in id:87si7kx27c.fsf at maritornes.cs.unb.ca; I think
compact changing uuid is a short term problem.

d