Add queue peek support

Filter out "deleted" documents in search queries 

Adjust request init logging level to debug

Ensure analysis conflict delete messages are the same

Use (now available) pypi tempfile backport

Revise delete permissions

Add elapsed to job completion ticket

Look for non-deleted containers on packfile endpoint

Fix handling of multi-value file fields

Some clients (e.g. Swagger), rather than specifying `file1`, `file2`, etc... will
specify multiple values for `file` when uploading multiple files.
This code change will handle lists of values for individual fields.

Menagerie of job handler improvements

Add range read and other request information to file download documentation