Added code to show off wxDbGrid (contributed by Paul and Roger Gammans) in wxUSE_NEW_...

Added code to show off wxDbGrid (contributed by Paul and Roger Gammans) in wxUSE_NEW_GRID is set to 1.  If grid is not enabled, the program does not compile in the wxDbGrid portion of the sample
Fixed a bug in the SetColDef() descriptions that had the Contribs column defined as a UCHAR but the SQL data type was set to be SQL_C_SHORT when it needed to be SQL_C_UTINYINT to match the size of the UCHAR data variable
General code cleanup
TRUE/FALSE changed to true/false
Now uses new wxDbLogExtendedErrorMsg() function for reporting human readable ODBC errors

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@10505 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775