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Implements a buffer with insertion points. When you know you need to
"get back" to a place and write more later, simply call insertion_point()
at that spot and get a new StringIOTree object that is "left behind".

EXAMPLE:

>>> a = StringIOTree()
>>> _= a.write('first\n')
>>> b = a.insertion_point()
>>> _= a.write('third\n')
>>> _= b.write('second\n')
>>> a.getvalue().split()
['first', 'second', 'third']

>>> c = b.insertion_point()
>>> d = c.insertion_point()
>>> _= d.write('alpha\n')
>>> _= b.write('gamma\n')
>>> _= c.write('beta\n')
>>> b.getvalue().split()
['second', 'alpha', 'beta', 'gamma']

>>> i = StringIOTree()
>>> d.insert(i)
>>> _= i.write('inserted\n')
>>> out = StringIO()
>>> a.copyto(out)
>>> out.getvalue().split()
['first', 'second', 'alpha', 'inserted', 'beta', 'gamma', 'third']
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