querystorage: add full text search
cryptostorage: fix confusing exemple

/reviewed-on nexedi/jio!62

ReplicateStorage: signature_hash_key is used also for attachments.
QueryStorage: support multiline text search.

/reviewed-on nexedi/jio!61

Speed up attachment replication by using a document property to check if there was a change.
The attachment content is NEVER checked, as this configuration expect the document to be modified when an attachment is created, modified or deleted.
In case of conflict, follow the document conflict resolution result.

allAttachments was supposed to return no result in some tests.

ReplicateStorage: fix some attachment replication issues

If the document was deleted, user does not want probably to see it reappear identical.

Drop bulk prototype.
ReplicateStorage: add signature_sub_storage and signature_hash_key parameters.

Speed up document replication by using a document property to check if there was a change.
As allDocs can return this property directly, it reduces the required calculation.