fixed #706 : handling fresh/new user scenario, creates Notebook 1 by default

Assigning the new notebook number based on availability and create 'Notebook 1' in case of new/fresh user login.
Thanks, yes it does affect the existing fork logic, which always increments the number in the description passed in.  I think we want slightly different behavior for new notebooks, starting from 1.

You are already passing in "Notebook 1", so it should parse the 1 okay - is this not working?