Replaced the code to build the bounds by a call to the new slice2bounds function in sheet. The same code is performed, but it has been moved in slice2bounds so that to have the two function slice2bounds and bounds2slice both in sheet.py.
Replaced the code to build the bounds by a call to the new slice2bounds function in sheet. The same code is performed, but it has been moved in slice2bounds so that to have the two function slice2bounds and bounds2slice both in sheet.py.


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