* CLI history: [Preserve CLI command history across sessions. The up/down arrows](https://github.com/clicon/clixon/issues/79)

* The design is similar to bash history:
      * The CLI loads/saves its complete history to a file on entry and exit, respectively
      * The size (number of lines) of the file is the same as the history in memory
      * Only the latest session dumping its history will survive (bash merges multiple session history).
      * Tilde-expansion is supported
      * Files not found or without appropriate access will not cause an exit but will be logged at debug level
  * New config options: CLICON_CLI_HIST_FILE with default value `~/.clixon_cli_history`
  * New config options: CLICON_CLI_HIST_SIZE with default value 300.

test/test_cli.sh

@@ -1,5 +1,5 @@
 #!/bin/bash
-# Test1: backend and cli basic functionality
+# Backend and cli basic functionality
 # Start backend server
 # Add an ethernet interface and an address
 # Show configuration