Added an alternative constructor to PGSQLException so that debugging

Peter Mount <peter@retep.org.uk>

Commit: f118c36a7811b0a9e4c733863bc34c592c4a647f
Author: Peter Mount <peter@retep.org.uk>
Date: 2001-01-25T09:16:36Z
Releases: 7.1.1
Added an alternative constructor to PGSQLException so that debugging
          some more osteric bugs is easier. If only 1 arg is supplied and it's
          of type Exception, then that Exception's stacktrace is now included.

This was done as there's been a report of an unusual bug during connection.
This will make this sort of bug hunting easier from now on.

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