6.6 Documentation needed for new Import UI

The 6.6 release includes a new UI feature for importing data into Couchbase. This feature should be described in the documentation.

Important details are:

• The Import panel is accessible as a sub-tab of the Documents section. (see first screen shot)
• This feature is intended to be an easier-to-use alternative to cbimport, though it is about 10x slower and can't handle files > 100MB (and it's pretty slow on files > 30MB).
• The Import UI can import files in the following formats: tab-separated, comma-separated, JSON, with one JSON document per line in the file, and a JSON list. The user selects a file, and the format is automatically detected. If, however, the detection is wrong, the user can select a different format.
• After the file is parsed by the UI, the resulting JSON documents are shown, either as a table (default) or raw JSON. If the user wants to verify the original data file, that is viewable also.
• If the user is happy with how the data was parsed, they then need to select a destination bucket, and what to use for the imported documents IDs. The choices are either a UUID or a single field from data. The menu shows only those fields that are present in every document. (Unlike the screen shots, I have changed the label "GUID" to "UUID" to match the terminology used by cbimport.)
• Because the UI is about 10x slower than cbimport, the UI also shows the equivalent cbimport command syntax if the user wants to do the import that way.
• Once the user clicks the "import" button, status is shown in a label below the button. If the import takes a long time, the label on the button changes to "cancel", and the user can cancel the import using that button.