There's not much point in binding to localhost when it's in a docker container.

This is mostly a documentation change, but also adds a default value for
SYNAPSE_CONFIG_PATH, so that running from the generated config is the default,
and will Just Work provided your config is in the right place.

* Fix JWT login with register

Signed-off-by: Pau Rodriguez-Estivill <prodrigestivill@gmail.com>

* Add pyjwt conditional dependency

Signed-off-by: Pau Rodriguez-Estivill <prodrigestivill@gmail.com>

* Added changelog file

Signed-off-by: Pau Rodriguez-Estivill <prodrigestivill@gmail.com>

* Improved changelog description

Signed-off-by: Pau Rodriguez-Estivill <prodrigestivill@gmail.com>

this makes docker builds a bit faster.

Signed-off-by: Jon Richter <jon@allmende.io>

Fixes #4901

Closes #4583

Does slightly less than #5045, which prevented a room from being upgraded multiple times, one after another. This PR still allows that, but just prevents two from happening at the same time.

Mostly just to mitigate the fact that servers are slow and it can take a moment for the room upgrade to actually complete. We don't want people sending another request to upgrade the room when really they just thought the first didn't go through.

Fixes #3370.

Python 3.7 is apparently faster than 3.6, and should be mature enough.

Updates the v1.0.0 changelog to provide more information to those upgrading to v1.0 on why they may receive errors or find their password reset abilities have now been disabled.

Helps address #5444

Fixes #5533

Adds information about how to install and run black on the codebase.

* Pull config_dir_path and data_dir_path calculation out of read_config_files

* Pass config_dir_path and data_dir_path into read_config

This makes some of the conditional-import hoop-jumping easier.

This has no useful purpose on python3, and is generally a source of confusion.

* group the arguments together into a group
* add new names "--generate-missing-config" and "--config-directory" for
  existing cmdline options "--generate-keys" and "--keys-dir", which better
  reflect their purposes.

Add some comments, and simplify `read_config_files`.

Make it a bit clearer what's going on.

Fixes https://github.com/matrix-org/synapse/issues/5431

`jinja2` was being imported even when it wasn't strictly necessary. This made it required to run Synapse, even if the functionality that required it wasn't enabled. This was causing new Synapse installations to crash on startup.

Email modules are now required.

There is a README.txt which always sets off this warning, which is a bit
alarming when you first start synapse. I don't think we need to warn about
this.

Fixes intermittent errors observed on Apple hardware which were caused by
time.clock() appearing to go backwards when called from different threads.

Also fixes a bug where database activity times were logged as 1/1000 of their
correct ratio due to confusion between milliseconds and seconds.

I had to add quite a lot of logging to diagnose a problem with 3pid
invites - we only logged the one failure which isn't all that
informative.

NB. I'm not convinced the logic of this loop is right: I think it
should just accept a single valid signature from a trusted source
rather than fail if *any* signature is invalid. Also it should
probably not skip the rest of middle loop if a check fails? However,
I'm deliberately not changing the logic here.