'mitre' typo causes exception on saving

Created originally on Bitbucket by n23 (TC)

Message: AttributeError: 'bool' object has no attribute 'to_tree'

../drawing/line.py:128

../drawing/line.py:162

Note last one must be changed from 'self.mitre = bevel' to 'self.miter = miter' or it won't work

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