#11 Input Table Spreadsheet supporting formulas

[Cinly Ooi]

In support of
https://sourceforge.net/tracker/index.php?func=detail&aid=1589447&group_id=161344&atid=819462,
we might want to allow simple formula/procedures to be
attached to individual cell. This means the value for
these cells are computed later. There are questions,
such as when should these values be computed (before
the final pipeline/data is created, or should it be
generated on-the-fly during pipeline execution?