Adding test with Simbad check

[dr-rodriguez]

This adds a test to address issue #20. It will query Simbad for all sources by their Source.source name and then loop over the results to verify that they are not present in the database for more than one source. It handles the Simbad query properly to avoid hundreds of individual calls to their service.

Matching is done by exact name, so binaries will generally not match against each other (ie, TWA 27 does not match TWA 27B).

[kelle]

So, let's say that there's an object called CoolStar-1 and it's located at 0102-0340. Let's assume it's source name is some variation of it's coordinates, say 2MASS J010234-03401234. So this query will find all the Other names listed for this in SIMBAD and make sure those other names are not also Source Names? E.g., if CoolStar-1 was listed as an other name AND there was another entry in the database with CoolStar-1 as the primary source name, this test would find it? Do I have that right?

[dr-rodriguez]

Correct.
The example I was hoping to catch was TWA 27, which was listed as two independent sources:
TWA 27 and 2MASS J12073346-3932539
Instead, they should have been two names for the same single source.

[kelle]

Great! Happy to merge once conflict is resolved.