Item11780: Func::expandCommonVariables should ASSERT if called in initPlugin

FindElsewherePlugin was corrupting other extensions. MichaelDaum discovered that it was calling Foswiki::Func::expandCommonVariables() during initialization. As this function depends upon all plugins being initialized, it causes issues.

• Document in Func that it should only be called after all plugin initialization has been completed.
• Add an ASSERT to error if called during initialization.

-- GeorgeClark - 19 Apr 2012

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