@NonNull
    static Single<Boolean> deleteModifiedCoordinates(@NonNull final Geocache cache) {
        return editModifiedCoordinates(cache, null);
    }
Merge log entries and mark them as friends logs (personal and friends) to identify
them on friends/personal logs tab.

@param mergedLogs  the list to merge logs with
@param logsToMerge the list of logs to merge
main/src/main/java/cgeo/geocaching/connector/gc/GCParser.java