Distance order is not preserved

[timrobertson100]

The geocode service is not preserving the ordering by distance.

This shows the problem.

SELECT layer, id, distance FROM query_layers(4.02, 50.02, 0.05, ARRAY['IHO', 'EEZ', 'Political', 'GADM1', 'GADM2', 'GADM3', 'Centroids', 'WGSRPD']);
   layer   │      id       │      distance
───────────┼───────────────┼────────────────────
 Political │ FR            │                  0
 GADM3     │ FRA.7.2.1_1   │                  0
 GADM2     │ FRA.7.2_1     │                  0
 GADM1     │ FRA.7_1       │                  0
 GADM3     │ FRA.7.1.5_1   │ 0.0261643707422069
 GADM2     │ FRA.7.1_1     │ 0.0261643707422069
 WGSRPD    │ WGSRPD:FRA-FR │                  0

We need to add ORDER BY distance to the Mapper SQL here and all the references to Collection should be replaced by List in the code relating to this (the service API, implementation, and WS resource)

[MattBlissett]

Collections replaced by Lists