Retrieve owner name and cache size for duplicate search

[FriedrichFroebel]

When searching duplicates, the owner name and the cache size are not considered for now as Okapi.getCache (called by Okapi.getCachesAround) does not retrieve them. We already check for null values in the GeocacheComparator class, but we might want to test whether including the owner name and cache size on the initial comparison will improve the overall detection ratio.

Some problems might arise from the different naming schemas used on both sites, especially when including the cache size, so we need some careful evaluation or correct mapping. Owner names might differ as well.