add initial support for viewing variants in the sdk config tree. refactor some code which initializes sbsv2 contexts. some hacks added for re-loading configurations when the default config is a variant.

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<?xml version="1.0" encoding="UTF-8"?>

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<?eclipse version="3.2"?>

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<plugin>

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   <extension-point id="featureUseTracker" name="Feature Usage Tracker" schema="schema/featureUseTracker.exsd"/>

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</plugin>