- modified a couple of method from memory to use client instead of profile
- XEP-0115: don't use unique hash for all clients anymore, as disco can be different between clients/components, and even between clients (different identity for instance).
hash is now generated per client on each new session.
new <comments> element is added to file metadata, it contains the URL to the comments virtual node and the count of comments (this way client knows if it make sense to request comments or not).
Fixed triggers in plugin XEP-0264 (return value was missing).
New trigger in plugin XEP-0329 to allow component to add metadata (used here for comments url).
comments use a minimal pubsub service which create virtual nodes for each files. A pubsub request to org.salut-a-toi.file_comments/[FILE_ID] allow to handle comments in classic way.
Permissions are the same as for files (i.e. if an entity can see a file, she can comment it).
the plugin do an implementation for client and component.
For client, any directory from local file can be shared.
For component file are stored using new file handling mechanism from SàT.
Permission is handled, using "public" and "whitelist" for now.
