Misc. session list cleanups

[nonprofittechy]

This has some small cleanups to the session list page.

• Redirect to sign-in page if user is logged out
• Default to not showing interviews that are on page 1
• Allow author to specify a list of filenames that won't appear on the session list page (and a new global config option)
• Reset to page 1 if a session is renamed
• Show the display title (including auto_title) as a placeholder when someone clicks to rename a session

Fix #578 Fix #571 Fix #573 Fix #572 #592

[mnewsted]

I like these changes @nonprofittechy . Thanks! I'm a little confused by this one:

• Show the display title (including auto_title) as a placeholder when someone clicks to rename a session

Which is display title? Is auto_title the default plaintiffs v. defendants if it's a court case?

[nonprofittechy]

Right, it's whatever is in ordinary weight on the session list (not the bold clickable title)

And yes, the default is users v. other_party

[BryceStevenWilley]

Code LGTM, didn't do a UI review, but Matt and you will have better thoughts there