The {quote: SrcList} object was not being expanded correctly by a call to

The {quote: SrcList} object was not being expanded correctly by a call to
sqliteSrcListAppend() if the {quote: SrcList} had previously been duplicated by
a call to sqliteSrcListDup().  Ticket #416. This check-in fixes that problem
by keeping a separate nAlloc field on {quote: SrcList}.  A similar change is made
to {quote: IdList} and {quote: ExprList} to avoid future problems. (CVS 1067)

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