Write "hasReplies" to database for inline comments

Summary:
Ref T1460. Ref T2618.

When publishing a draft inline, mark the inline it replies to (if any) as replied to.

Also, don't load deleted comments as drafts (sets the stage for T2618).

I'll make an effort to clean up the loading mess here in the next revision, and find some more appropriate home for the shared code.

Test Plan: Made and replied to comments in Differential and Diffusion. Saw comments get marked as "Has Replies" and "Is Reply".

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T2618, T1460

Differential Revision: https://secure.phabricator.com/D12025