Derive Num and Integral for ParamIndex, ColumnIndex, ColumnCount, and CNumBytes
Derive Num and Integral for ParamIndex, ColumnIndex, ColumnCount, and CNumBytes

This sacrifices explicit annotation of arguments in favor of convenience.
But it still, for the most part, retains the basic type safety we want.

IreneKnapp/direct-sqlite,IreneKnapp/direct-sqlite