This reverts commit 42f37e39.

This prevent getting DB read/write conflicts

Do not access form submission REQUEST from the listbox list method,
as it is rendered asynchronously in ERP5JS

Allow edition in the new UI

This make everything slow as hell and prevent to quickly save.

ZODB Components: Preparation of erp5_base migration from FS: Fix pylint unbalanced-tuple-unpacking warning.

ZODB Components: Preparation of erp5_base migration from FS: Fix pylint unused-import and unused-variable warnings.

New workflow actions added in 67f58b5b and b3dc32f5 thus adjust accordingly.

/reviewed-on !996

Folder_getDeleteObjectList could do an extra paranaoïa check that the
caller did not pass an empty list of uids, because this would cause the
script to iterate on the full catalog table.

We now have getRelationCountForDeletion API for this.

The general approach is:
- replace deprecated lambdas with list comprehensions
- remove unused variables/imports
- replace dangerous arguments [] with ()
- replace dangerous arguments {} with None and "if None -> {}"
- replace builtin names with something similar

Now that all problems reported by pylint are fixed, enable coding style
test.

This was not valid HTML5:

  AssertionError: Using nu validator to parse the view "SQLMethod_view" (from erp5_core bt) with warnings displayed :
  Error: line 782 column 23 : Element “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.): </script>
  <style type="text/css">
    .cm
  Error: line 822 column 23 : Element “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.): script>

  <style type="text/css">
    .max

This fix a regression from 920655a2 : when item has no tracking, uid was
passed an empty list and this fetched all catalog.
Also call getObject explicitly only once instead of having it called
implicitly twice.

/reviewed-on nexedi/erp5!988

/reviewed-on nexedi/erp5!1000

/reviewed-on nexedi/erp5!1002

- indent the json representation of error
- if error is an XMLHttpRequest:
  - include the server side error response in an iframe
  - split response headers

/reviewed-on nexedi/erp5!981