[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

[repo looping task] move looping task logic in a dedicated object (progress #2204047)

[manage / default index views] discard login/logout templates

devtools-request: transmit the headers keyword argument to the request class Otherwise the headers kwargs end up in the form. This is very useful for testing publish logic related to http header (as cache).