slice-jacks jacks-app and slice-map should share manifests

[MarshallBrinn]

Following up on an unresolved issue in #1264, the slice-jacks page has two different tabs (jacks-app and slice-map) both of which cause manifests and sliver info to be queried.

Ideally we should make only one set of queries and send them to the appropriate pages.

I think this is possible but hard. The slice-map needs a server-side function (slice-map-data.php) that dishes up the JSON file required for the map. So it needs the manifests and sliver info on the server side. The jacks stuff needs the information on the client side (java script).

I think we should revisit this if it turns out to be a performance problem.

Imported from trac ticket #1270, created by mbrinn on 01-16-2015 at 12:30, last modified: 03-31-2015 at 10:23