[doc] small doc improvement

[doc] fix Pyro url

[doc] fix Narval project url

[tutorial] minor documentation fixes

merge 3.16.x fix in 3.17.x

merge 3.15.x into 3.16.x

server/source/native: fix wrong usage of .lstrip that produce garbled error messages (closes #2777641) Fixed an .rstrip(...) for the general case (untested). Fixed an .lstrip(...) for the sqlite path (tested).

[doc] update 3.17 release note

[migration] fix bug in `CWAttributeAddOp.revertprecommit_event` The `rdefdef` attribute is set during the operation execution. In some the operation crash before this assignment. In such case `revertprecommit` raise an attribute error crashing the whole process and shadowing the original error. This changeset detect and Avoid this situation.

[session] security context directly use transaction object when applicable Most of the security logic have been moved on Transaction anyway.

[session] move context manager logic in the security context manager The `init_security` and `reset_security` method have no other user that the context manager itself. Having dedicated public function is not useful.

[session] hook control context directly use transaction object when applicable Most of the hooks control logic have been moved on Transaction anyway.

[session] move context manager logic in the hook controls context manager The `init_hooks_mode_categories` and `reset_hooks_mode_categories` have no other user that the context manager itself. Having dedicated public function is not useful.

[session] drop the useless set_hooks_mode method It has not external user and trivial code

[session/transaction] move most undo support into transaction A small part that need repo access has not been moved into transaction yet.

[session] simplify mode property We can delegate very thing to transaction utility

[session/transaction] pass the session object to the Transaction __init__ This simplify access to variables. As we are moving more and more logic and states in the Transaction it will greatly helps in future commit.

[session] use a dedicated class to track cnxset We introduce a new CnxSetTracker to track `cnxset` used by Transaction and allows to wait for them. This new class does not use Thread ID not thread joining to work. This allows to use multiple transaction per thread and a transaction in multiple thread. The class itself is totally threadsafe by the Transaction is still not thread safe. The old _threads_in_transaction attribute is dropped in favor of a new logic based on this object. The registration of cnxset used is not done by the Transaction itself. tx.cnset is a property handling the Consistency of its value with the CnxSetTracker instance. Note: The CnxSetTracker instance only track transaction id, not transaction itself, So not reference cycle are created.

[session] cleanup Transaction.cnxset The attribute should always be there. It is None when not cnxset exists.

[session] drop useless getter and setter for security Those function have very few user and does not anything fancy. Internal user now access tx.read/write_security directly. External user have been blessed with a writable property. They are only interested in the write part of they did not used the return of the removed function. They access it through the session since I prefer the external world to not be aware of Transaction yet.

[session/transaction] move read_security subtlety in transaction This is transaction data, itshould be handled by the transaction itself.

[transaction] initialize dbapi_request in __init__ There is not reason to have it implicitly declared. The attribute is renamed to match its public name.

[whatsnew] notify drop of deprecated code

[web/views] extract cube embed (closes #1916015)

[skeleton] Update debian packaging to support only python 2.6 and up

Drop iprogress code (closes #2777628)

[web/views] extract cube sioc (closes #1916018)

[doc] Add 3.17 release notes

[migration] mark all version prior 3.7 as non-migrable API possible used by such old migration script are not supported in recent Cubiweb. Closes #2772958

[dataimport] drop checkpoint backward compat API Deprecated since 3.7. See #2772958 for details.