[tx] Datoms resolved in earlier round of upserts are dropped from later generations

[ncalexan]

Well, this is embarrassing. While evolving generations, the transactor upserts as much as possible in a round, and then resolves what it can. Unfortunately, we don't accumulate resolved datoms correctly, dropping them as the generations evolve, leaving them unapplied to the store.

[ncalexan]

Addressed by 46c2a08.