add FT::date_only, FT::time_only and FT::no_time_zone flags

src/postgresqlexpression.h

@@ -45,8 +45,6 @@ class PostgreSQLExpression : public DbExpression
 {
 public:
 
-	void esc(const pt::Date & date, pt::TextStream & stream, const FT & field_type);
-
 	DbExpression & page(pt::TextStream & stream, size_t page_number, size_t page_size);