Persist generated speed limits for empty road links
Remove road link join when selecting speed limit
Do not insert into lookup table if no road links found for area
Set value for generated speed limits

While at it when splitting speed limit set value in DAO
Persist generated speed limits for partially covered road links
Insert all created speed limits in one db insert
Merge pull request #324 from finnishtransportagency/persist_generated_speedlimits

Persist generated speedlimits