Recreate solr config on buildout update if the
directory of the solr-instance was deleted.
[mghh]
New option 'additionalFieldConfig'.
This option allows for additional configuration options
in <fields>...</fields> section of schema.xml
Use this if you have dynamicFields
[mghh]
New option 'directoryFactory'.
Use it to define the solr directoryFactory for a Solr instance.
[mghh]
See CHANGES.txt: