stack/erp5: remove some unused eggs

erp5.recipe.w3validator is not installed, it was just a version pin
because when running buildout updating the software needs a version
pin, by now all softwares must have been updated.

stack/erp5/buildout.cfg

@@ -469,7 +469,6 @@ eggs = ${neoppod:eggs}
   pytz
   requests
   responses
-  threadframe
   urlnorm
   uuid
   xml_marshaller
@@ -524,9 +523,7 @@ eggs = ${neoppod:eggs}
   five.localsitemanager
 
 # Other products
-  Products.DCWorkflowGraph
   Products.MimetypesRegistry
-  Products.ExternalEditor
   Products.TIDStorage
   Products.LongRequestLogger
 
@@ -552,10 +549,8 @@ eggs = ${neoppod:eggs}
   ipykernel
 
 # Used by DiffTool
-  xmltodict
   deepdiff
   unidiff
-  jsonpickle
 
 # WSGI server
   zope.globalrequest
@@ -668,9 +663,6 @@ zope.app.testing = 3.8.1
 APacheDEX = 1.8
 Pillow = 6.2.2
 Products.CMFActionIcons = 2.1.3
-Products.DCWorkflowGraph = 0.4.1
-# Products.ExternalEditor 2.0.0's dtml is not based on Zope2 OFS's one.
-Products.ExternalEditor = 1.1.1
 Products.GenericSetup = 1.8.6
 Products.LongRequestLogger = 2.1.0
 # Products.MimetypesRegistry 2.1 requires AccessControl>=3.0.0Acquisition.
@@ -713,7 +705,6 @@ rsa = 3.4.2
 spyne = 2.12.14
 suds = 0.4
 facebook-sdk = 2.0.0
-threadframe = 0.2
 urlnorm = 1.1.4
 uuid = 1.30
 validictory = 1.1.0
@@ -732,8 +723,6 @@ zope.globalrequest = 1.5
 waitress = 1.4.4
 xlrd = 1.1.0
 
-# Re-add for as it is required to be there for uninstallation
-erp5.recipe.w3validator = 1.0.2
 Products.ZSQLMethods = 2.13.5
 fpconst = 0.7.2
 graphviz = 0.5.2
@@ -748,7 +737,6 @@ mpmath = 0.19
 openpyxl = 2.4.8
 sympy = 1.1.1
 jdcal = 1.3
-xmltodict = 0.11.0
 deepdiff = 3.3.0
 unidiff = 0.5.5
 jsonpickle = 0.9.6