developer-level changes in Silva 1.1

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Developer level changes in Silva
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 From 1.0 to 1.1:

* The previously deprecated method 'archive_file_import' on Folder.py
   and the ImportArchive module have been removed. Code that depended on
   this should be rewritten to use the archivefileimport adapter.

* deprecated SQLDataSource has been removed; use SilvaExternalSources
   instead.

* XSLT support for document renderers. While this shouldn't break
   existing code, it opens up new possibilities for extension
   writers. You can register your own XSLT templates with Silva that
   handle content rendering. Read doc/xslt_renderers_howto.txt for more
   information

* new parser in forms-based editor. The existing parser for bold,
   italic and the like in the forms based editor has been scrapped and
   replaced with a parser that uses a simple HTML subset. The new
   parser should be more predictable for authors and a lot
   faster. Developers who have written their own widgets-based editors
   may need to modify code. If you already use the Silva-1.0
   infrastructure for finding the parser, the changes should be minimal
   and be limited to the UI, however. The Silva-1.0 pattern is::

     supp = context.editorsupport.getMixedContentSupport(model, node)
     supp.parse(text)

* new method on Folder objects, get_public_tree_all().  Returns a list
   of all published content objects (including containers) below this
   object (not including this object itself), including non-transparent
   containers like publications.