Race conditions on gitit-users and .git/index.lock

I am using selenium and test-framework to test a simple gitit plugin (mostly to see how well haskell tools work for web testing) . When I run the tests in parallel I get random failures apparently from race conditions:

```
Server error: UnknownError: Could not git commit UniqueString9.page
fatal: Unable to create '/home/sakari/src/gitit-form/gitit-build/wikidata/.git/index.lock': File exists.

If no other git process is currently running, this probably means a
git process crashed in this repository earlier. Make sure no other git
process is running and remove the file manually to continue.
```

and

```
Server error: gitit-users: openFile: resource busy (file is locked)
```

I have a cabalized package at https://sakari@github.com/sakari/gitit-template.git from where you can run the test suite (run the "Basic gitit operations" testGroup, the template stuff needs a hack to gitit to work).