Text portion of an XmlNode type

[LaughingBubba]

I opted against `innerText` because it does indeed return the text of the node 
and all it's children:
    
    
    import xmltree
    
    var e = newElement("child1")
    e.add newText(" jibber")
    
    var f = newElement("child2")
    f.add newText(" jabber")
    
    var x = newXmlTree("root", [e, f])
    x.add newText(" some text")
    
    echo x
    echo x.innerText
    
    
    Run

gives:
    
    
    <root><child1> jibber</child1><child2> jabber</child2> some text</root>
     jibber jabber some text
    
    
    Run

and I just want:
    
    
    some text
    
    
    Run

So I posit that the `text` proc is broken, or at the very least, `xmltree` 
library is missing a `nodeText` proc that returns the text as string for that 
node only.