Key properties

Hard times seem to be behind. Cross fingers.

Now that pwd works with a new format (JSON), I can start to implement a few enhancements I wanted to do.

The first is a bunch of key "properties": attach extra information to each key. For the moment, three properties are implemented: username, url, and tags.

I am quite proud of the tags system. It was really missing. It will help segregate keys on user criteria.

This is not yet over. I need more work on accessing and changing the key properties in the console and maybe the menu clients, and in the webclient.

MOre happy hacking to come.