Dialect definitions missing _BEGIN and _END defines

[gregrahn]

At some point the dialect definitions lost the following two lines and dsqgen will error if not present.

define _BEGIN = "-- start query " + [_QUERY] + " in stream " + [_STREAM] + " using template " + [_TEMPLATE];
define _END = "-- end query " + [_QUERY] + " in stream " + [_STREAM] + " using template " + [_TEMPLATE];

[gregrahn]

Fixed in this repo via 8ebb21690055a336593a15a45961e901787f6d20