change the ints in the syntax to be integers

partially add buildExprParser hack to deal with some nested prefix and
  postfix unary operators
add new file which starts going through the sql2003 grammar to try to
  create lots of examples for comprehensive testing of sql2003
  support.
replace the lexers with lexers from the tutorial project

Language/SQL/SimpleSQL/Syntax.lhs

@@ -57,7 +57,7 @@
 >     | IntervalLit
 >       {ilLiteral :: String -- ^ literal text
 >       ,ilUnits :: String -- ^ units
->       ,ilPrecision :: Maybe Int -- ^ precision
+>       ,ilPrecision :: Maybe Integer -- ^ precision
 >       }
 >       -- | identifier without dots
 >     | Iden Name
@@ -130,8 +130,8 @@
 
 > -- | Represents a type name, used in casts.
 > data TypeName = TypeName String
->               | PrecTypeName String Int
->               | PrecScaleTypeName String Int Int
+>               | PrecTypeName String Integer
+>               | PrecScaleTypeName String Integer Integer
 >                 deriving (Eq,Show,Read,Data,Typeable)