AP_Mission: allow for more jump commands on high memory boards

and allow override of maximum in custom hwdef.dat

libraries/AP_Mission/AP_Mission.h

@@ -28,7 +28,13 @@
 #define AP_MISSION_EEPROM_VERSION           0x65AE  // version number stored in first four bytes of eeprom.  increment this by one when eeprom format is changed
 #define AP_MISSION_EEPROM_COMMAND_SIZE      15      // size in bytes of all mission commands
 
+#ifndef AP_MISSION_MAX_NUM_DO_JUMP_COMMANDS
+#if HAL_MEM_CLASS >= HAL_MEM_CLASS_500
+#define AP_MISSION_MAX_NUM_DO_JUMP_COMMANDS 100     // allow up to 100 do-jump commands
+#else
 #define AP_MISSION_MAX_NUM_DO_JUMP_COMMANDS 15      // allow up to 15 do-jump commands
+#endif
+#endif
 
 #define AP_MISSION_JUMP_REPEAT_FOREVER      -1      // when do-jump command's repeat count is -1 this means endless repeat