New Import: Partial

Problem/Motivation

Currently there are 3 import modes:

• Safe - adds missing items, NO UPDATE.
• Full - imports items, deleting ones not in config.
• Force - imports, deleting all, whether in config or not.

An additional mode would be nice:

• Update: adds missing items, updates existing items.

Adding an additional button makes the web gui cluttered, so also perhaps revamp the interface to one import button with option radios:

() Update Existing Items    (*) Do NOT Update Existing Items 

(*) Do not Delete Items   () Delete items NOT in config before importing  () Delete items in config before importing  () Delete ALL items before importing

[Import Button]