[Zope] SQLSession and 2.1.6

[sathya]

Discoverd the following issue.
In version 2.1.4
I call <dtml-call Session> within a dtml-method .
I then call this DTML method in my DTML-documents and refer to SESSION.
In 2.1.4 the SESSION object was available in the namespace
on migrating to 2.1.6 I discovered that the objects created in DTML methods are
not added to the global namespace such that they are available in other
Documents . So i now explicity call Session right at the beginning of every
document

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 necessity is the 
mother of invention
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