Add missing with_statement import for python2.5 compat

[devtools] make xvfb-run not wait 3s each time (closes #2265710) Ask Xvfb to tell us when it's ready instead of unconditionally waiting 3 seconds. Sync from http://anonscm.debian.org/gitweb/?p=pkg-xorg/xserver/xorg-server.git;a=blob_plain;f=debian/local/xvfb-run;hb=HEAD

[view] breadcrumbs layout broken with long elements (closes #1347486)

[static-file] return Unauthorized on blocked directory listing This is more appropriate than 404 NOT FOUND

[login redirect] only add postlogin_path argument when meaningful

static-file: properly set/use cache header for static file (closes #2255013) This changesets enables the standard http cache mechanism where the static controller may reply "304 Not modified" based on `last-modified` in HTTP response and `if-modified-since` in HTTP query. The last modified time is computed using the file-system information. The pre-existing logic using an `Expires` header to prevent client from sending request stay in place. The new logic just prevents sending the file again if not necessary.

[repository] move task manager instantiation outside repository. Repository callers are in charge of providing a task manager. The task manager is optional when the repository is not a server. This part is not really expected to work well yet. But we aim to remove all task management responsibilities from the Repository object.

[repository] split repo initialization from starting looping task (closes #2204047) This separation highlights that two distinct operations are done. This is a step towards a full distinction between repo, server and looping tasks