Wizard key structopts

Implements the following command using new structopts paramters style :

durs keys modify member --salt [salt] --password [password]
durs keys modify network --salt [salt] --password [password]
durs keys delete member # remove the member key
durs keys delete network # reset the network key to a new random one
durs keys show
durs keys wizard

conf/Cargo.toml

@@ -16,6 +16,7 @@ serde_json = "1.0.*"
 dirs = "1.0.2"
 dup-crypto = { path = "../crypto" }
 dubp-documents= { path = "../documents" }
+rpassword = "1.0.0"
 duniter-module = { path = "../module" }
 
 [features]