Reordered opcode_t

Moved all opcodes that use unsigned types before the signed types AND
ordered signed types into BYTE, CHAR, HWORD, INT, WORD, LONG.  This is
not only logically consistent but also looks prettier.

lib/prog.h

@@ -91,34 +91,6 @@ typedef enum
   OP_EQ_WORD,
 
   // Mathematical operations
-  OP_LT_BYTE,
-  OP_LT_CHAR,
-  OP_LT_HWORD,
-  OP_LT_INT,
-  OP_LT_LONG,
-  OP_LT_WORD,
-
-  OP_LTE_BYTE,
-  OP_LTE_CHAR,
-  OP_LTE_HWORD,
-  OP_LTE_INT,
-  OP_LTE_LONG,
-  OP_LTE_WORD,
-
-  OP_GT_BYTE,
-  OP_GT_CHAR,
-  OP_GT_HWORD,
-  OP_GT_INT,
-  OP_GT_LONG,
-  OP_GT_WORD,
-
-  OP_GTE_BYTE,
-  OP_GTE_CHAR,
-  OP_GTE_HWORD,
-  OP_GTE_INT,
-  OP_GTE_LONG,
-  OP_GTE_WORD,
-
   OP_PLUS_BYTE,
   OP_PLUS_HWORD,
   OP_PLUS_WORD,
@@ -131,13 +103,42 @@ typedef enum
   OP_MULT_HWORD,
   OP_MULT_WORD,
 
+  // Comparison operations
+  OP_LT_BYTE,
+  OP_LT_CHAR,
+  OP_LT_HWORD,
+  OP_LT_INT,
+  OP_LT_WORD,
+  OP_LT_LONG,
+
+  OP_LTE_BYTE,
+  OP_LTE_CHAR,
+  OP_LTE_HWORD,
+  OP_LTE_INT,
+  OP_LTE_WORD,
+  OP_LTE_LONG,
+
+  OP_GT_BYTE,
+  OP_GT_CHAR,
+  OP_GT_HWORD,
+  OP_GT_INT,
+  OP_GT_WORD,
+  OP_GT_LONG,
+
+  OP_GTE_BYTE,
+  OP_GTE_CHAR,
+  OP_GTE_HWORD,
+  OP_GTE_INT,
+  OP_GTE_WORD,
+  OP_GTE_LONG,
+
   // Simple I/O
   OP_PRINT_BYTE,
   OP_PRINT_CHAR,
   OP_PRINT_HWORD,
   OP_PRINT_INT,
-  OP_PRINT_LONG,
   OP_PRINT_WORD,
+  OP_PRINT_LONG,
 
   // Program control flow
   OP_JUMP_ABS,
@@ -145,6 +146,7 @@ typedef enum
   OP_JUMP_IF_BYTE,
   OP_JUMP_IF_HWORD,
   OP_JUMP_IF_WORD,
+
   // Subroutines
   OP_CALL,
   OP_CALL_STACK,