Raise error when trying to assign a list of values to a cell.

Issue #267 resolved
created an issue
from openpyxl import Workbook
wb = Workbook()
wb = ws.active
ws['A1'] = [1, 2, 3]
cell = ws['A1']

This creates a cell with a value of the string representation of the list. But this won't serialise properly. The inference either needs to be better or, preferably, an exception is raised.

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