largefile: use `self` in repo method instead of `repo` Most method added (or overwritten) to repo by largefile works on `repo` instead of `self`. This currently works without trouble because `self` and `repo` are likely the same. However this is semantically dubious and this may cause issue for filtering. `self` may be proxy object different from the `repo` one. This changeset fix that and use `self` when applicable.

test: use proper subclassing in `test-issue2137.t`. To use changelog filtering on the repository, we plan to use "proxy" object that perfectly mock a repository but with a filtered changelog. Altering the `repo.commit` function using `extensions.wrapfunction` will prevent the logic to propagate to the proxy class by the mean of inheritance. We changes the extension to use subclassing as expectable.

run-tests: remove dead code for supporting old test scripts

run-tests: handle windows crlf in .py tests again Before af7c6bc48d8d all crlf occurrences in test output on Windows were simply changed to lf. In af7c6bc48d8d it was replaced by more clever handling in the .t test runner ... but the .py runner was forgotten and many .py tests were failing on Windows. The crlf/lf replacement is now reintroduced in the py test runner.