Reliability: remove all "unwrap()" and deny their use

To prohibit the use of unwrap(), add this line to the root of each crate (lib.rs file):

`#![deny(clippy::option_unwrap_used, clippy::result_unwrap_used)]`

Then replace all unwrap() by unwrap! macro :

`expr.unwrap() -> unwrap!(expr)`

The unwrap! macro displays the name of the source file and the line number, in case of a bug related to an unwrap, it allows to immediately find the unwrap in fault.

Stabilization commit can be the subject of a new type of commit: [stab] (to be added to the doc). Otherwise, use the [fix] type because it can prevent future bugs.