[atlas] More even earth distribution of measurement probes

I'd like to check worldwide connectivity to my site. I create a new 
measurement via web-interface and add, say, 300 probes, expecting them 
to cover most world countries. However, looking at the map 
<https://atlas.ripe.net/measurements/7861872/?filter=#map> I notice that 
most are selected from Europe: there're two dozens in Netherlands (many 
with same ASNs), but only two in Australia, one in Japan and nothing in 
Brazil. Obviously, most ATLAS probes are from Europe, and selection 
algorithm does not take probe density into account.

Wouldn't it be nice to have the following features in web-interface and API:
* even distribution of probes by country or continent based on 
population, area, and other user-defined weight numbers;
* avoiding probes with same ASNs
?

I don't know how current algorithm works, but easiest modification would 
be two-step process: (1) randomly select country based on specified 
weights; (2) randomly select probe within country, avoiding earlier 
selected probes or ASNs and failing if none are left available; repeat 
from step 1 until necessary number of probes is selected.

P.S. I tried to manually request 1 probe from each country, but stumbled 
on unrecognised country codes, countries with no probes etc. before even 
trying population-weighted distribution. Without direct access to probes 
database nice solution can be difficult to achieve via current API, 
although crude one looks possible.

P.P.S. I understand this option will create more load on probes in 
less-covered countries, but since it's possible to limit selection to 
specific countries anyway this is hardly a strong argument against 
adding this feature.

--

With Best Regards,
Marat Khalili
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