erp5_web_mynij_search: Move CreateIndexDoc method to model and reuse it for importing from torrent and file

Index can be saved to a Json file and shared to others users.
The json file can also be imported in Mynij to avoid build the index from scrash

Seed torrent in background
Add import index from torrent in source page
Activities page show seeder status

Add possibility to download index from torrent, seed by another browser peer, browser can also seed his local indexed to other browsers.

User hash de possiblity to enable or disable seeding of an index.

speedup search page by storing indexes name in settings.

Build some sitemap can take 3G of RAM or more and freeze the browser or tab. Reduce amount of running ajax queries per time and make sure objects will be removed in memory after usage.

Mynij Search: improve performance, build index now in backround, load body text in result is defered

Improve general search performances
Build index will now run in background and popup when build is finished
when result loaded, fetch body text in another task to speedup.

Fix search form also