Changes to balance_nonroot() and BtreeDelete() to simplify delete operations and reduce stack/heap usage while balancing b-tree structures. (CVS 6768)

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-C Fix\sa\slink\serror\sand\swarning\sthat\scan\soccur\sin\swhere.c\swhen\scompiling\sunder\sMSVC\swith\sSQLITE_OMIT_VIRTUALTABLE\sdefined.\sTicket\s#3914.\s(CVS\s6767)
-D 2009-06-16T14:15:22
+C Changes\sto\sbalance_nonroot()\sand\sBtreeDelete()\sto\ssimplify\sdelete\soperations\sand\sreduce\sstack/heap\susage\swhile\sbalancing\sb-tree\sstructures.\s(CVS\s6768)
+D 2009-06-16T16:50:22
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