add to_xlsx function

[charlesdwright]

Dumps sheets, cells and formulae from graph to xlsx
Todo: handle ranges, test with larger & more complex sheets, ?

Specific case:

‘’’Create workbook and spreadsheet instance’’’
>>> from koala.ExcelCompiler import ExcelCompiler
>>> from koala.Spreadsheet import Spreadsheet
>>> sp_scratch = Spreadsheet()

‘’’Create graph manually per docs”
>>> sp_scratch.cell_add('Sheet1!A1', value=1)
>>> sp_scratch.cell_add('Sheet1!A2', value=2)
>>> sp_scratch.cell_add('Sheet1!A3', formula='=SUM(Sheet1!A1, Sheet1!A2)')

>>> sp_scratch.cell_add('Sheet2!A4', value=1)
>>> sp_scratch.cell_add('Sheet2!A5', value=2)
>>> sp_scratch.cell_add('Sheet2!A6', formula='=SUM(Sheet2!A4, Sheet2!A5)')

‘’’Dump graph to .xlsx’’’
>>> sp_scratch.to_xlsx('blah')

[charlesdwright]

It's now called "to_excel()" and supports output of named ranges.