DB structure
Restore tabs + completed refresh_feeds
Ajout du .vimrc
Tags for feeds
Tags should be working with refresh rss
Forgot one empty not retrocompatible
Merge tag support

* `refresh_rss()` is now almost complete. TODO: Old tags deletion + old
articles deletion.
* Final stats: 39 feeds, 586 entries and 542 tags takes:
    * 5s to download,
    * 1s to add in database
    * Total: 6s for the whole synchronization (on my Kimsufi)
Merge