allow config of --max-sequences in batch mode

[bwprice]

--max-sequences / -ms should be configurable in batch mode too.

Open questions:

1. What should the output look like:
   (a) multi-fasta with all sequences for the match together
   (b) single fasta file per match

2. How will this data be reflected in the summary CSV?

3. What happens if 3/5 are at Genus match and remaining 2/5 are at Family match - how to represent with current reporting?