Props JS Morisset

https://wordpress.org/support/topic/fyi-v452-typo-in-class-coauthors-guest-authorsphp

…nstead of concatenating and echoing strings.

…-emails

Send moderation email even if guest author has no email address

Better formatting for metabox_manage_guest_author_bio()

Update CLI to use cached functions

Not really being used in other tests

We can use these to verify that our author query mods work

And add an additional test for post_author + tax query

Known issue in CAP

We need to check for both INNER and LEFT JOINs to avoid adding a dupe
query which leads to query errors in 4.6+.

See Automattic#374

4.6 Compat

Currently, create-guest-authors is an all or nothing proposition. What happens though when you are 50% complete with a 30,000 user import and then accidently close your terminal window?  You have to start over.  By allowing chunking of create-guest-authors, this can be continued from the number that have been completed rather than starting from scratch