[DBCP] Remove SQLNestedException

[Dain Sundstrom]

DBCP-143 talks about problem with propagation of SQLNestedException  
to clients and the comment suggests a conversion to normal Java  
nested exception when we switch to Java 1.4.  Since we made the leap,  
I did a bit of refactoring to remove this exception class.  Basically  
I replace:

  new SQLNestedException(msg, e);

with:

  (SQLException) new SQLException(msg).initCause(e);

I attached this at a patch to 143 as I'm not 100% sure we want to go  
this direction.

So, should we drop SQLNestedException?

-dain

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