Merge branch 'fix_ttl_field' into 'master'

Make RR TTL field 4 bytes

See merge request !31

src/block.h

@@ -355,7 +355,7 @@ namespace CDNS {
 
         index_t name_index;
         index_t classtype_index;
-        boost::optional<uint8_t> ttl;
+        boost::optional<uint32_t> ttl;
         boost::optional<index_t> rdata_index;
     };
 

src/interface.h

@@ -34,7 +34,7 @@ namespace CDNS {
 
         std::string name;
         ClassType classtype;
-        boost::optional<uint8_t> ttl; // Not used in Question records
+        boost::optional<uint32_t> ttl; // Not used in Question records
         boost::optional<std::string> rdata; // Not used in Question records
     };