[CBBS] Task item count can be misleading

What's the issue?
The task item count is currently an aggregate, IMO this can be misleading. For example, say you have the following scenario:

1) Backup
2) Restore (with force updates)
3) Backup
4) Merge

The item count will be that of the total number of items from both backups when in reality, you'll only actually have the items from the last backup.

We should probably use the reported value from info, instead of aggregating the stats, although this may not be possible (since we don't store that data in the task history).

Either way, we should look to improve/clear this up this if possible.