Small tweaks to quotas duplication

This PR:

- Sets notes fields as text areas for the duplication form;
- Adds information about which quotas shall be copied;
- Adds note to explain that descendants of taxon concepts are not taken into consideration for the count method (or should I just change it for them to be considered? Was a bit worried that this would make the count slower);
- Injects the year passed as params into the years available in the index page, so that after a duplication is requested and before it is done, the dropdown includes that year;
- Adds index to extract(year from start_date) of the trade_restrictions table.