Add sanitization function

[hickeng]

I've made mistakes sanitizing the doc for sharing before, and have just found another.

Add a function to do this for me:

• apply the same logic the Censored export does, but to the live sheet
• add a mechanism to identify Notes that should be censored
• add a means of detecting overrides to prepopulated inputs and revert those to prepop value
• return dropdowns, etc to defaults
• if doing Import 1099-B data #59 delete duplicate datagrid rows