Move wendelin.core from Wendelin to ERP5

We are starting to use wendelin.core not only in Wendelin context.
So it makes sense to have it installed in base ERP5, like we already do for
example for NumPy and SciPy.

/reviewed-by @rafael, @jp
/reviewed-on !874

software/wendelin/software.cfg

 [buildout]
 versions = versions
 extends =
-  ../../component/wendelin.core/buildout.cfg
   ../../component/msgpack-python/buildout.cfg
   ../../component/msgpack-numpy/buildout.cfg
   ../../component/scipy/buildout.cfg
@@ -12,7 +11,6 @@ parts +=
   msgpack-python
   msgpack-numpy
   ipython
-  wendelin.core
   jupyter
   jupyter-notebook-initialized-scripts
 
@@ -26,7 +24,6 @@ eggs +=
   ${scipy:egg}
   ${msgpack-python:egg}
   ${msgpack-numpy:egg}
-  ${wendelin.core:egg}
   ${ipython:egg}
   
 [generic_testrunner_init]

stack/erp5/buildout.cfg

@@ -53,6 +53,7 @@ extends =
   ../../component/zbarlight/buildout.cfg
   ../../component/pylint/buildout.cfg
   ../../component/perl-Image-ExifTool/buildout.cfg
+  ../../component/wendelin.core/buildout.cfg
   ../../stack/caucase/buildout.cfg
   ../../software/jupyter/software.cfg
   ../../software/neoppod/software-common.cfg
@@ -373,6 +374,7 @@ initialization =
 <= neoppod
 eggs = ${neoppod:eggs}
   ${caucase-eggs:eggs}
+  ${wendelin.core:egg}
   ${numpy:egg}
   ${matplotlib:egg}
   ${lxml-python:egg}