make a plan to run batch of scans from a spreadsheet file

[prjemian]

To use a spreadsheet as a multi-sample batch scan tool, need a plan that will read the spreadsheet and act on it. There are examples of run_Excel_file(xl_file) in the USAXS instrument and a development workstation.

The ideal plan should:

• use an Excel spreadsheet (for starters)
• read a table from the spreadsheet file
• take a single action from each row in the table
• decide action based on a specific named column in the table
• report all columns as metadata for the action
• ignore empty rows
• ignore any data outside of the table boundaries

[prjemian]

Difficult to generalize this since the action and its parameters (args & kwargs) will be different in every implementation. Might be better to show as an example in a notebook.

[prjemian]

Deferring ignore any data outside of the table boundaries to #116

This issue will be complete once the new notebook is added to the documentation.