Give audits a clickable commit title, even if they are importing or messageless

Summary:
Fixes T3854. Subversion allows commits with no message, and in other cases we might not have imported the message yet. In these cases, we may not render any text inside the link.

When we hit these cases, render appropriate replacement text.

Test Plan: {F156229}

Reviewers: btrahan, chad

Reviewed By: chad

Subscribers: epriestley

Maniphest Tasks: T3854

Differential Revision: https://secure.phabricator.com/D9169
Index inline comments on commits

Summary: Fixes T3044. We currently don't add these to the index.

Test Plan: Made a unique inline comment on a commit, then searched for it.

Reviewers: btrahan, chad

Reviewed By: chad

Subscribers: epriestley

Maniphest Tasks: T3044

Differential Revision: https://secure.phabricator.com/D9170
Remove some needless +x flags.
Provide a rough, unstable API for reporting coverage into Diffusion

Summary:
Ref T4994. This stuff works:

  - You can dump a blob of coverage information into `diffusion.updatecoverage`. This wipes existing coverage information and replaces it.
  - It shows up when viewing files.
  - It shows up when viewing commits.

This stuff does not work:

  - When viewing files, the Javascript hover interaction isn't tied in yet.
  - We always show this information, even if you're behind the commit where it was generated.
  - You can't do incremental updates.
  - There's no aggregation at the file (this file has 90% coverage), diff (the changes in this commit are 90% covered), or directory (the code in this directory has 90% coverage) levels yet.
  - This is probably not the final form of the UI, storage, or API, so you should expect occasional changes over time. I've marked the method as "Unstable" for now.

Test Plan:
  - Ran `save_lint.php` to check for collateral damage; it worked fine.
  - Ran `save_lint.php` on a new branch to check creation.
  - Published some fake coverage information.
  - Viewed an affected commit.
  - Viewed an affected file.

{F151915}

{F151916}

Reviewers: chad, btrahan

Reviewed By: btrahan

Subscribers: jhurwitz, epriestley, zeeg

Maniphest Tasks: T5044, T4994

Differential Revision: https://secure.phabricator.com/D9022
Fix binary/utf8 issues with Differential changeset parse cache

Summary:
Fixes T4898. After we increased the strictness of the `%s` conversion, most `serialize()` output is rejected from the cache.

Drop the cache, change the column type to latin1_bin, and then use `%B` to mark the data as binary during query construction.

Test Plan: Viewed Differential, saw cache fills.

Reviewers: btrahan, spicyj

Reviewed By: spicyj

Subscribers: epriestley

Maniphest Tasks: T4898

Differential Revision: https://secure.phabricator.com/D9171