Add to the Advanced Search > Names tab > Search filters: a new filter - 'Is Alive?' flag

Task: show alive persons only!

Thus, need to an exclude all persons with an existing (filled) 'Died' field from search results.

Currently, we can order list by the 'Death date' only, but this is not a solution!

All alive persons will be always at the end of list results.

So, if we have e.g. 10, 20, 30, etc. pages then alive persons will be on the page 'N' and not on the Top of list.

This makes searching difficult.

Solution: I thought it would be cool an idea to add a new 'Is Alive?' flag for resolve that, like as a quick filter.

For resolve this could be exists and another ways:

- smth similar as for 'Gender identity' with an options: Alive, Died, Both

- update the 'Death date' order options for show Alive persons at the Top and/or add new sort option

- update 'Death date' filter for pass values e.g. '1899-01-01' date and/or 'NULL' which will be equals to no (empty) 'Died' field 

Make sense?

P.S. previously, were a few bypasses for manually resolve this via URL: smth like: !has=death-date and or has!=death-date

But now, there are all obsolete and doesn't works..