Improved help functionality

Now each command can (should!) add a help function.  This
is done by editing commands.h to add the function name for
the function printing out the help text.

Added help text for the config command.

This help function will be called when eurephiadm is called with:

	eurephiadm -h <command>
	eurephiadm --help <command>
	eurephiadm help <command>

In addition the command function should also parse arguments and
call the help function when --help or -h argument is given, like

	eurephiadm config -h
	eurephaidm config --help

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