Merge branches/slinkp-zopectl-exitcode-143813: Fixes bug 143813, zopectl should exit non-zero if child processes fail.

Second of three tests. Calling ViewPageTemplateFile's without any arguments worked so far. The version in zope.app.pagetemplate always requires one to pass in the view as an argument. Examples in the wild are found in plone.app.portlets.

Added a test for the first of three problems found in real life applications with the ViewPageTemplateFile

'unrestrictedTraverse' (apparent NameError).

by the GenericSetup community)

attribute names for content_type text/html and text/xml

of the environ)
(This patch landed first on the 2.11 branch (by TS))

is ready to serve requests. You can subscribe to this event e.g.
for starting application-level threads. 

Base the default location of softwarehome on Zope2, which is guaranteed not to be a namespace but always located inside the Zope2 software home. This fixes Zope2 breaking on systems which uses namespace packages for Products.*

Revert c81408 HelpSys changes, it didn't make much of a difference. Making the whole help system optional would be a better approach.

Revert ISO8601 interpretation to previously broken behaviour (assume GMT rather than local time as per spec)