Passing lf.Global instance from the constructor, part7.
This is part of a series of CLs, in order to allow multiple Lovefield
instances
to run without collisions, a.k.a "Lovefield as a component".
In this CL:
 - Updating constructor of lf.proc.Database and lf.base.init.
 - Replacing static method lf.Global.reset with instance method
   lf.Global#clear() and calling clear() from Database#close(),
   such that all singleton services can be garbage collected.

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