Big refacto

This MR introduces a lot of changes and refacto, I do not squash the commits in order to let more explanation about how it was done.

doc/example.md

@@ -2,38 +2,40 @@
 
 Useful when developing: replace `gcli` by `cargo run --` to build in debug mode and launch gcli.
 
-## Mnemonics
+## Configuration
 
-Used in duniter-indexer genesis config:  
-`pipe paddle ketchup filter life ice feel embody glide quantum ride usage`
+It can be handful to use Gcli with a configuration file to avoid passing arguments on every command.
 
-with derivations:
-
-- `//2` → `test1`
-- `//4` → `test2`
-- `//6` → `test3`
-
-Used in substrate for Alice, Bob and Co:  
-`bottom drive obey lake curtain smoke basket hold race lonely fit walk`
-
-with derivations:
+```sh
+# show config commands
+gcli config
+# show where config file is stored
+gcli config where
+# save config to use gdev network for next commands
+gcli --network gdev config save
+# save config to use Alice predefined secret
+gcli -S predefined -s Alice config save
+# these can be combined
+gcli --network local -S predefined -s test1 config save
+```
 
-- `//Alice`
-- `//Bob`
-- `//Charlie`
-- ...
+In the following, we assume this last command was run.
 
 ## Commands
 
 ```sh
 # get duniter current block
-gcli current-block
-# get balance of test1 account
-gcli --address 5FeggKqw2AbnGZF9Y9WPM2QTgzENS3Hit94Ewgmzdg5a3LNa get-balance
+gcli blockchain current-block
+# get balance of configured account
+gcli account balance
+# get identity information without indexer
+gcli --no-indexer identity get -a 5Hn2LeMZXPFitMwrmrGucwtAPSLEiP4o5zTF7kHzMBtEkJUr 
 # get information about test1 identity (needs indexer)
-gcli identity --username test1
-# show address of given secret
-gcli --secret "pipe paddle ketchup filter life ice feel embody glide quantum ride usage"//2 show-address
+gcli identity get --username test1
+# claim universal dividends
+gcli ud claim
+# transfer 5000 units
+gcli account transfer 5000 5E4i8vcNjnrDp21Sbnp32WHm2gz8YP3GGFwmdpfg5bHd8Whb
 ```
 
 ## Indexer commands
@@ -42,7 +44,7 @@ You can check first that indexer is on the same network as Duniter node:
 
 ```sh
 # check if indexer is on the same chain as duniter
-gcli check-indexer-against-blockchain
+gcli indexer check
 ```
 
 The following commands uniquely relate with indexer.