This reverts commit e702b719.

- this fixes a unit test on code mirror app
- WIP: all changes in connector must be discarded/reverted

This first work on WSGI is only to stop using ZServer (Medusa),
which is a required step before moving to Zope 4. This means that
Zope should behave almost exactly the same way as before, notably:

- We don't take advantage yet of what WSGI offers, like IPv6.
- There's extra code to handle errors the same way as before
  (this is something we'll have to change for Zope 4).

The most significant change in behaviour is that the chosen WSGI server
(waitress) does some of the HTTP work in worker threads (Medusa does it
entirely in the IO thread), and the biggest consequence concerns the
deadlock debugger that is now run from the worker thread:
- it does not work if all threads are blocked
- doing better would require to patch waitress in a quite ugly way

About TimerService, we simplify things by removing the egg.
In zope.conf, it's possible to import from the product.

/reviewed-on nexedi/erp5!883

At the same time, timerserver is no longer distributed as an egg.

zope.globalrequest is a new dependency of Zope 4
and it is already used by the backported WSGIPublisher.

Parts of ZPublisher.utils are also backported.

This is a preliminary commit that only adds a verbatim copy of WSGIPublisher.py

Clinking on the rows of item tracking view was not working in renderjs ui.

/reviewed-on nexedi/erp5!894

Since BankAccount_view already has a my_comment field

Example for erp5_web_renderjs_ui_test:testFunctionalRJSRelationField, which
was failing randomly (fixed in ca229c3e):

======================================================================
FAIL: testFunctionalTestRunner (erp5.component.test.erp5_version.testFunctionalRJSRelationField.TestRenderJSUIRelationField)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../product/ERP5Type/tests/ERP5TypeFunctionalTestCase.py", line 372, in testFunctionalTestRunner
    self.fail('\n'.join(error))
AssertionError: These messages are pending: [('/erp5_portal_faeed2c6ad773e8de11c3b643708ad55/portal_catalog', 'unindexObject', -1, 0), ('/erp5_portal_faeed2c6ad773e8de11c3b643708ad55/foo_module', 'immediateReindexObject', -1, 0), ('/erp5_portal_faeed2c6ad773e8de11c3b643708ad55/bar_module', 'immediateReindexObject', -1, 0), ('/erp5_portal_faeed2c6ad773e8de11c3b643708ad55/foo_bar_module', 'immediateReindexObject', -1, 0), ('/erp5_portal_faeed2c6ad773e8de11c3b643708ad55/portal_preferences/erp5_ui_test_preference', 'immediateReindexObject', -1, 0), ('/erp5_portal_faeed2c6ad773e8de11c3b643708ad55/foo_module/2', 'immediateReindexObject', -1, 0), ('/erp5_portal_faeed2c6ad773e8de11c3b643708ad55/foo_module/2', 'immediateReindexObject', -1, 0), ('/erp5_portal_faeed2c6ad773e8de11c3b643708ad55/foo_module/3', 'immediateReindexObject', -1, 0), ('/erp5_portal_faeed2c6ad773e8de11c3b643708ad55/foo_module', 'immediateReindexObject', -2, 1), ('/erp5_portal_faeed2c6ad773e8de11c3b643708ad55/bar_module', 'immediateReindexObject', -2, 1), ('/erp5_portal_faeed2c6ad773e8de11c3b643708ad55/foo_bar_module', 'immediateReindexObject', -2, 1), ('/erp5_portal_faeed2c6ad773e8de11c3b643708ad55/portal_preferences/erp5_ui_test_preference', 'immediateReindexObject', -2, 1)]
Last error message:
RuntimeError
tic is looping forever.
Traceback (innermost last):
  Module ZPublisher.Publish, line 138, in publish
    request, bind=1)
  Module ZPublisher.mapply, line 77, in mapply
    if debug is not None: return debug(object,args,context)
  Module ZPublisher.Publish, line 48, in call_object
    result=apply(object,args) # Type s<cr> to step into published object.
  Module Products.ERP5Type.patches.ExternalMethod, line 113, in __call__
    return _f[0](self.aq_parent, *args, **kw)
  Module erp5.component.extension.erp5_version.ERP5Zuite, line 21, in waitForActivities
    raise RuntimeError('tic is looping forever.')
RuntimeError: tic is looping forever.

testAccessUnauthorizedRelationValue
testBreadcrumbCanNotAccessRelationSearchPage
testMultiRelationDefaultSortAndParameterList
testMultiRelationFieldEmptySearchWithListbox
testMultiRelationFieldHomonyms
testMultiRelationFieldSearchWithListbox
testMultiRelationFieldSearchWithProxyListbox
testMultiRelationFieldUnknownIcon
testMultiRelationFieldWithNonSavedPageContent
testProxyListBox
testRelationDefaultSortAndParameterList
testRelationFieldEmptySearchWithListbox
testRelationFieldRefresh
testRelationFieldSearchWithListbox
testRelationFieldWithNonSavedPageContent
testSimpleMultiRelationField

----------------------------------------------------------------------
Ran 1 test in 199.267s

Ensure permission removal is done after the indexation