PoC for Notebooklet functions.

[ianhelle]

POC for creating functions to be used/reused in notebooklets.
Functionality:

• decorator for functions to turn them into notebooklet functions
• supports standard functions (that may or may not return anything)
• supports query functions that work by defining query text or built-in query name in body of function
• functions automatically get common args like timespan, value, data, options, etc. passed
• optionally update the results object with attribute from return value of function.
• can be used by user to add custom function to already-defined notebooklet (requires notebooklet to call run_nb_funcs in runmethod.