fix broken DatabaseConfigurationProvider interface

Summary: broken by rPd27e7c52b21865563bd56f37d5d422515aa40bb7

Test Plan: sigh

Reviewers: epriestley, edward, levijackson

Reviewed By: epriestley

CC: Korvin, aran

Differential Revision: https://secure.phabricator.com/D6816
Add missing `$port` property

Summary: See rPd27e7c52b21865563bd56f37d5d422515aa40bb7.

Test Plan: eyeballed it

Reviewers: wez

Reviewed By: wez

CC: aran

Differential Revision: https://secure.phabricator.com/D6818
Generate PHP function documentation in Diviner

Summary:
Ref T988. Various improvements:

  - Generate function documentation, mostly correctly.
  - Raise some warnings about bad documentation.
  - Allow `.book` files to exclude paths from generation.
  - Add a book for technical docs.
  - Exclude "ghosts" from common queries (atoms which used to exist, but no longer do, but which we want to keep the PHIDs around for in case they come back later).

This is a bit rough still, but puts us much closer to being able to get rid of the old Diviner.

Test Plan: See screenshots.

Reviewers: btrahan, chad

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T988

Differential Revision: https://secure.phabricator.com/D6812