Implemented better error handling in the SQLite3 framework

The core sqlite_query() function will now always return a pointer to a
dbresult structure.  This structure now contains a query status and
the error message from the sqlite3 backend if something went wrong.

This means that error checking from now on should use the
sqlite_query_status() macro and not to check if sqlite_query() returns
NULL.

Another fundamental change is that sqlite_free_results() must always be
called on the dbresult structure now, to free the memory used by either
data from the query or the error message.

Signed-off-by: David Sommerseth <dazo@users.sourceforge.net>

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