util: flush stdout before calling external processes stdout could have content in its buffer while a subprocess ran and emitted output. Flushing stdout ensures that output now comes in the right order.

tests: update test-https.t output I must have lost the insecure cert warning in a last minute patch series cleanup of 08f9c587141f.

Do not allow merging with uncommitted changes in a subrepo

hgwebdir: reduce memory usage for index generation The archive list generator was holding a reference to each temporary ui copy passed by rawentries(), so the memory usage for index generation growed proportionally to the ui object size and the amount of repositories. By returning a list instead, the temporary reference is dropped immediately.