When getting a raw file in gitlab with ajax a first OPTIONS request is send, this simply fail because not implemented. To solve the problem, we allow nginx to reply to OPTIONS request and allow GET method.

/reviewed-on !663

vscode's Python extension works on this version.

/reviewed-on !643

This runs in a go workspace, but we don't need to always have the
(gowork) marker.

We don't want theia to use /tmp/ this prevents running more than one
instance (for example we can only install vscode extensions once. golang
language server is also broken)

if yarn.lock is changed, part should be re-installed. This is only
useful during development.

- exclude .pyc in files list
- exclude .env for virtualenv
- don't watch git (not sure it's really needed)
- use 2 spaces on editors
- use Vifib's plantuml service
- use Ctrl for multi cursor (for chromeos where alt is right click)

Also stop including python, as we can use vscode python instead.
Add a README to describe how to do this.

(our latest version)

I set that to try to be independent from user config files/environment
variables, but that was a bad idea and not needed (I did that to
investigate an issue I had with jedi, but it was not depending on
environment variables - it was depending on the presence of a
buildout.cfg in current directory)

json was not formatted with `./format-json` this was causing test
failures.

The main change is a new and unique way to override parameters depending on where these parameters are used:
- for NEO, the goal is to avoid a huge `node_list` value (in particular with MyRocks settings), whereas most of the time all values in the list are the same
- for ERP5, we need a way to define different ZODB cache settings depending on the zope id (e.g. huge cache for some specialized zopes, a small cache for the validation node, etc. whereas currently a huge cache for all nodes would waste a lot of RAM)

For any `key=value` parameter that can be overridden, overriding is done as follows:
- `key` defines the default value (not required if the SR already defines one)
- `key!=[[pattern, value],...]`: the SR takes the value of the first 2-tuple whose *some reference* matches the pattern

For NEO:
- new `node_count` and `node` parameters
- `node!` can be used to override `node`: the *reference* is the partition reference (`node-<i>` for standalone NEO, and `neo-<i>` for ERP5)
- `node_list` is deprecated (if still passed, the new parameters must not be present)

For ERP5 ZODB settings, parameters can be overridden at both:
- zodb level (e.g. `pool-size`, `cache-size`... oh, I've just discovered there exists `cache-size-bytes`)
- storage level (e.g. `compress`, `cache-size`, etc. in the case of NEO)

Here, the *reference* is the zope id (e.g. `actitivies-0`)

The `pattern` is a Python regex that must match the whole reference.

Another not-so-small change is that the schema is fixed to only require NEO `cluster` parameter when instanciating a standalone NEO.

And a few fixes.

/reviewed-on nexedi/slapos!661

Some eggs to provide "intelliense" for python withing ERP5

/reviewed-on nexedi/slapos!649