[datafeed] properly call hooks for inlined relations on entity creation. Closes #2481156

[sources/native] automatically update passwords using deprecated hashes on login Closes #2465904

[repo pyro] fix previous commit: should not import Pyro in remoterql module/base class, it may be missing

massive copyright update to avoid clutering later patches

minor cleanups/typos

[session / querier] reorganize code to building result set descriptions

[web] search state doesn't need cnx, remove useless test

[schema] rename schema permissions function: session may also be a request, use _cw

[repo initialisation] during repo creation, load all hooks and entities code this simplify code and make it more consistent

[request/session] refactor language handling: don't attempt to sync web/repo languages This decouple thing and make code easier to understand. Previous behaviour was fine w/ validation error that were translated on the server side, but isn't satisfying for notification and all. Now: * translations should be done on the ui side (see previous validation error refactoring) * consistent behaviour: each side (web/repo) is responsible to deal with its request/session of language, no weird interaction between them on this topic * drop on the way the 'session properties' api, used only for that matter. -> much simpler/cleaner/saner api The thing missing being a way for user to tell "My favorite language is xxx but I also want cw to consider my http language header)