fixup! BT: read metadata (bt/* files) through BusinessTemplateArchive

Use _download_local instead of _importBT because this method was removed
BTreeData: fixed some minor issues with truncate
BTreeData: also check truncate(0)
set causality to the origin Event in Support Request.
Keep the error body as is.

If it has to be fixed, do it on the server.
Update renderJS.

Use a development version based on renderJS 0.7.2.
Stop using development RSVP.
Update cache manifest
Migrate Extensions to portal_components
disable preconversion if validation state is draft, deleted, cancelled or achived
JSLint
add causality_translated_portal_type related key.
support translation of causality portal type in Support Request.
use restrictedTraverse instead of traverseName that is now private since Zope2-2.13.21.
BTreeData: change zodb representatin of big file data

This break existing stored data, though we assume this is not an
issue since this is not used yet except for a prototype
BigFile: allow to disable serialization to save space
update Base_isConvertible unit test
update unit test img preconversion from web page content

The 75 is the default value is most cases, I changed to 64 to be sure.
A useful comment is also added.
erp5_core: allow to select code mirror for text and code editors
ERP5TypeLiveTestCase: Remove FS reloader as ZODB Components should be used from now on.
erp5_code_mirror: Update to 3.22.