Add `bin/worker flood`, for flooding the task queue with work

Summary: Ref T6615. Ref T3554. We need better tooling around the queue eventually, so start here.

Test Plan: Added 100K+ tasks locally with `bin/worker flood`. Executed some of them with `bin/phd debug taskmaster` (we already have a TestWorker, used in unit tests).

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T3554, T6615

Differential Revision: https://secure.phabricator.com/D10894
Reverse meaning of task priority column

Summary:
Ref T6615. Mixing ASC and DESC ordering on a multipart key makes it dramatically less effective (or perhaps totally ineffective).

Reverse the meaning of the `priority` column so it goes in the same direction as the `id` column (both ascending, lower values execute sooner).

Test Plan:
  - Queued 1.2M tasks with `bin/worker flood`.
  - Processed ~1 task/second with `bin/phd debug taskmaster` before patch.
  - Applied patch, took ~5 seconds for ~1.2M rows.
  - Processed ~100-200 tasks/second with `bin/phd debug taskmaster` after patch.
  - "Next in Queue" query on daemon page dropped from 1.5s to <1ms.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: aklapper, 20after4, epriestley

Maniphest Tasks: T6615

Differential Revision: https://secure.phabricator.com/D10895
Clean up UITooltips

Summary: Fixes positioning issues by creating another container to hold the abs. positioned arrows. (Issues primarily presented on Workboards).

Test Plan: Test UI arrows on a workboard, applciation launcher, and in UIExamples.

Reviewers: btrahan, epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D10897
Expose transaction PHID in maniphest.gettasktransactions

Summary: Fixes T6629.

Test Plan: {F238271}

Reviewers: btrahan, chad, 20after4

Reviewed By: 20after4

Subscribers: 20after4, epriestley

Maniphest Tasks: T6629

Differential Revision: https://secure.phabricator.com/D10898
Don't show meme Remarkup hint button if Macro application is not usable

Summary: See <https://phabricator.wikimedia.org/T906>. This behavior is a bug; we should remove the button if the user can't use the application.

Test Plan:
- With Macro uninstalled, did these things verifying the button vanished:
  - Sent a user a message.
  - Edited a revision.
  - Edited repository basic information.
  - Edited an initiative.
  - Edited a Harbormaster build step.
  - Added task comments.
  - Edited profile blurb.
  - Edited blog description.
  - Commented on Pholio mock.
  - Uploaded Pholio image.
  - Edited Phortune merchant.
  - Edited Phriction document.
  - Edited Ponder answer.
  - Edited Ponder question.
  - Edited Slowvote poll.
  - Edited a comment.
- Reinstalled Macro and saw button come back.
- Used button to put silly text on a funny picture.

Reviewers: btrahan, chad

Reviewed By: chad

Subscribers: epriestley

Differential Revision: https://secure.phabricator.com/D10900
Fix inline project list on Chrome 39

Summary: T6622, changes the list to be inline instead of inline block.

Test Plan:
Tested Chrome/Win, Chrome/Mac, FF/Win, Safari/Mac, IE/Win

{F238296}

Reviewers: btrahan, epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D10901
Merge branch 'master' of github.com:facebook/phabricator