Distance details lookup fix

[int2001]

Old behaviour:

• Analytic / Distances worked: Distances are computed from every QSO fetched from the DB
• When clicking details, the QSOs were fetched by DISTANCE at DB

Since not every QSOs had a (computed or imported) distance, the details are not always show the same results than the graph.

New behaviour

• Analytic / Distances worked: Distances are computed from every QSO fetched from the DB. If distance at DB differs from computed distance, it's being updated.
• When clicking details, the QSOs were fetched by DISTANCE at DB

So, same result at details / graph

[AndreasK79]

Tested working with no errors. The regular user will not notice anything special, as the changes are done in the backend.