the "failIf..." naming scheme is deprecated in unittest, we should at
least have new-style named methods

When using checkPythonSourceCode integrated in the source code editor,
for a scenario where developer edit a component and save we can benefit
from caching the check message for the source code content, because the
same check that the one happening in the editor will happen when the
component is saved.

This cache varies on:
 - "component_packages" cache cookie which is reset every time some
component code is edited.
 - zope startup time to take into account editions of file system code.
This assumes that after reseting file system code zope will be
restarted.
 - portal_type, because the checks performed by this function also
depend on portal type.

this makes completions works when using Ctrl+space

This makes "Format Document" / "Format Selection" work.

because pylint is a bit slow on large components, debounce every 2
seconds. TODO: this is too slow.

For now this is just the portal_url, but I'm thinking it could be a
proper tool.

IIRC the only thing needed is that ERP5TypeTestCase.getPortal is an
ERP5Site

on very large python files (>1000 lines) sometimes they queue up and we
have to wait for all requests that were queued by zope.

XXX maybe this does not happen when accessing through haproxy/apache, I
am observing this when hitting zope directly

because title is acquire from id, we want to edit title first for the
case where we change ID, otherwise saving would save the old ID as
title.

 * don't set "hide rows on no search criterion", this should not display
too much and search is broken.
 * use preference to get number of lines

In monaco 0.20.0 "peek references" is not properly displayed when
automaticLayout is true. This is fixed on master branch so next release
should be OK.

For now, use a resize event handler to re-layout the editor when size
change, then we don't need the automaticLayout.

document.body is accessed very early in scripts loading, in
https://github.com/microsoft/vscode/blob/c6e3a94892eaccbce9995ee02a06febec5492fec/src/vs/editor/contrib/suggest/suggestRangeHighlighter.ts#L106
if we leave body after head, for some reason document.body is null here
and loading fail, which leaves an editor where things like Ctrl+Space
does not trigger completions

Moving body before head is just a workaround, but that was code was
removed in
https://github.com/microsoft/vscode/commit/f913854bd66362a1350ea43c305ad92c151796bf
hopefully when we update to monaco > 0.20.0 that won't be needed again.

 - Promise signature is different, we have canceller
 - delay was missing
 - Queue.push signature was incorrect

Using https://lab.nexedi.com/jerome/monaco-editor-erp5/ at revision
f59a79d15b7cfbb2f76d53fc01d2aab8e9316d40 and running:

    npm install
    npm run deploy -- --url=http://host:port/erp5/portal_skins/erp5_monaco_editor/monaco-editor --username=user --password=password

then use ERP5Site_setSkinCache to set cache

erp5_corporate_identity: only images with alt attribute specified will be added to the table with images

Since commit d2b20acd004441d1cb8d36f33ed7ca112dff0d17 on slapos.git we
are using gcc 8.2 which seem to generate slightly faster code, so we
adjust the min time because tests were failing because we are now too
fast.

erp5_corporate_identity: improve slideshow rendering including displaying legacy presentation as slideshow