tdb2/ntdb means that tdb_inc_seqnum can't be use directly

[Matthieu Patou]

Hello Rusty,

I was trying to use tbd_inc_seqnum and realized that write operation in 
tdb2 are using it also so it's not a good idea for me to use it tdb2/ntdb.

Did I misunderstood something ?

Matthieu.