Replaced <iostream.h> reference with "wx/ioswrap.h"

Replaced <iostream.h> reference with "wx/ioswrap.h"
Replaced wxMessageBox() with wxLogDebug() calls
When calling GetColumns(), some drivers/datasources would not return a proper value for columnSize.  If columnSize is less than 1, columnSize gets set to bufferLength
Some cout statements in DBDEBUG_CONSOLE were treating char* variables as if they were wxString variables.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@6294 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775