Log Message:
Update to 1.23:

1.23  Mon Oct 20 18:12:00 2014
	- Change output format when using node2string(), which is called by tree2string().
		Indentation which used to be '|---' is now '|--- '. So, a tree which used to \ 
be printed as:
		|---:default
		|   |---::=
		|   |---action
		|   |---=>
		|   |---[values]
		Is now printed as:
		|--- :default
		|   |--- ::=
		|   |--- action
		|   |--- =>
		|   |--- [values]
		This makes the difference between node names ''/'-', '1'/'-1', etc, much clearer.
		Apologies to anyone who runs tests which compare the output with pre-existing \ 
files.