Make the API more flexible (allow to ommit vizier: when crossmatching with a vizier catalog)
#4092
| Job | Run time |
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| 10s | |
| 20s | |
| 1m 45s | |
| 2m 55s | |
| 2m 52s | |
| 2m 10s | |
| 10m 12s |