uid is just software_release one, which will be used in joins.

Whenever it is changed, all related delivery lines have to be reindexed, as
this impacts software_release table.

Additionaly convert all to JSON.

 * explain all common errors once
 * drop extension, as content type is good enough
 * make requests looking like real HTTP requests, define required headers
 * explain inline possible values

Register function to hashchange event, not its result.

Simplify: control all by hashchange and just call it on load.

It allows to work on hashchanges on unsupported browsers.

Add another JSON getter.

(Removing trailing space at the same time).

Avoid having two same gid.