Removed fallback code for old `ZCatalog.catalog_object` function signatures from `Products.ZCatalog.ZCatalog.reindexIndex`.

Use the simple svn protocol in sources, Stefan and me couldn't make the nightly bot to work with svn+ssh so far

Remove the SMTPMailer duplicated from zope.sendmail and make its module a deprecated alias to the equivalent in z.s.

    
merge branch gotcha-LP143531

Some cleanup and provide an explicit test_suite function, the automatic discovery and ZopeTestCase don't seem to like each other

Added a new API ``get_packages_to_initialize`` to ``OFS.metaconfigure``. This replaces any direct access to ``Products._packages_to_initialize``. The OFS.Application.install_package function takes care of removing entries from this list now.

notify IDatabaseOpenedWithRoot

test also for IDatabaseOpened

Added a new API to ``OFS.metaconfigure.get_registered_packages`` which replaces any direct access to ``Products._registered_packages``.

Changed product install so it won't write persistent changes only to abort them. Instead we don't make any database changes in the first place.