Added linebreak code to partially fix #1 #3
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Added code to allow
\\
inside node labels to produce a newline in the output.getMainTextAndSubText
passes back the longest line so that the size of the node can be calculated correctly. It also passes back the number of lines which I hoped would allow the textbox to be sized correctly, but I couldn't make that resizing work properly, so for the moment the box doesn't surround the text with linebreaks correctly.