Debug output for addAlias is incorrect

[remkop]

The addAlias and removeAlias method incorrectly print the qualified name of the parent command instead of the qualified name of the command whose alias is being added.

Example:

top
  |
  +-- sub (alias: s)

The above would print:

[picocli DEBUG] Creating CommandSpec for TopCommand@557a1e2d with factory picocli.CommandLine$DefaultFactory
[picocli DEBUG] Creating CommandSpec for class SubCommand with factory picocli.CommandLine$DefaultFactory
[picocli DEBUG] Getting a SubCommand  instance from factory picocli.CommandLine$DefaultFactory@c7a975a
[picocli DEBUG] Factory returned a SubCommand  instance (2c1b9e4b)
[picocli DEBUG] Adding subcommand 'sub' to 'top'
[picocli DEBUG] Adding alias 's' for 'top'

That last line should be:

[picocli DEBUG] Adding alias 'top s' for 'top sub'

            private void addAlias(String alias, String name, CommandLine subCommandLine, Tracer t) {
                if (t.isDebug()) {t.debug("Adding alias '%s' for '%s'%n", (subCommandLine.parent() == null ? "" : subCommandLine.parent().qualifiedName() + " ") + alias, subCommandLine.qualifiedName());}