Fixes related to validating worksheet name uniqueness #155
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0523e90 (Edward Anderson, 5 minutes ago)
Worksheet name uniqueness doesn't apply to itself
This constraint would prevent you from creating a new worksheet with the
name that it would have gotten by default.
cac5b8a (Edward Anderson, 33 minutes ago)
Don't add worksheets to the workbook when initialize fails
Creating a worksheet with an invalid name would still add it to the
workbook, despite raising an exception.