patch 8.1.1256: cannot navigate through errors relative to the cursor

Problem:    Cannot navigate through errors relative to the cursor.
Solution:   Add :cabove, :cbelow, :labove and :lbelow. (Yegappan Lakshmanan,
            closes #4316)
diff --git a/src/ex_cmdidxs.h b/src/ex_cmdidxs.h
index 1531e68..c63aa46 100644
--- a/src/ex_cmdidxs.h
+++ b/src/ex_cmdidxs.h
@@ -8,29 +8,29 @@
   /* a */ 0,
   /* b */ 19,
   /* c */ 42,
-  /* d */ 103,
-  /* e */ 125,
-  /* f */ 145,
-  /* g */ 161,
-  /* h */ 167,
-  /* i */ 176,
-  /* j */ 194,
-  /* k */ 196,
-  /* l */ 201,
-  /* m */ 259,
-  /* n */ 277,
-  /* o */ 297,
-  /* p */ 309,
-  /* q */ 348,
-  /* r */ 351,
-  /* s */ 371,
-  /* t */ 439,
-  /* u */ 484,
-  /* v */ 495,
-  /* w */ 513,
-  /* x */ 527,
-  /* y */ 536,
-  /* z */ 537
+  /* d */ 105,
+  /* e */ 127,
+  /* f */ 147,
+  /* g */ 163,
+  /* h */ 169,
+  /* i */ 178,
+  /* j */ 196,
+  /* k */ 198,
+  /* l */ 203,
+  /* m */ 263,
+  /* n */ 281,
+  /* o */ 301,
+  /* p */ 313,
+  /* q */ 352,
+  /* r */ 355,
+  /* s */ 375,
+  /* t */ 443,
+  /* u */ 488,
+  /* v */ 499,
+  /* w */ 517,
+  /* x */ 531,
+  /* y */ 540,
+  /* z */ 541
 };
 
 /*
@@ -43,7 +43,7 @@
 { /*         a   b   c   d   e   f   g   h   i   j   k   l   m   n   o   p   q   r   s   t   u   v   w   x   y   z */
   /* a */ {  0,  1,  0,  0,  0,  0,  0,  0,  0,  0,  0,  4,  5,  6,  0,  0,  0,  7, 15,  0, 16,  0,  0,  0,  0,  0 },
   /* b */ {  2,  0,  0,  4,  5,  7,  0,  0,  0,  0,  0,  8,  9, 10, 11, 12,  0, 13,  0,  0,  0,  0, 22,  0,  0,  0 },
-  /* c */ {  3, 10, 12, 14, 16, 18, 21,  0,  0,  0,  0, 29, 33, 36, 42, 51, 53, 54, 55,  0, 57,  0, 60,  0,  0,  0 },
+  /* c */ {  3, 11, 14, 16, 18, 20, 23,  0,  0,  0,  0, 31, 35, 38, 44, 53, 55, 56, 57,  0, 59,  0, 62,  0,  0,  0 },
   /* d */ {  0,  0,  0,  0,  0,  0,  0,  0,  6, 15,  0, 16,  0,  0, 17,  0,  0, 19, 20,  0,  0,  0,  0,  0,  0,  0 },
   /* e */ {  1,  0,  2,  0,  0,  0,  0,  0,  0,  0,  0,  7,  9, 10,  0,  0,  0,  0,  0,  0,  0,  0,  0, 16,  0,  0 },
   /* f */ {  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  9,  0,  0,  0,  0,  0, 15,  0,  0,  0,  0,  0 },
@@ -52,7 +52,7 @@
   /* i */ {  1,  0,  0,  0,  0,  3,  0,  0,  0,  4,  0,  5,  6,  0,  0,  0,  0,  0, 13,  0, 15,  0,  0,  0,  0,  0 },
   /* j */ {  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  1,  0,  0,  0,  0,  0 },
   /* k */ {  0,  0,  0,  0,  1,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0 },
-  /* l */ {  3,  9, 11, 15, 16, 20, 23, 28,  0,  0,  0, 30, 33, 36, 40, 46,  0, 48, 57, 49, 50, 54, 56,  0,  0,  0 },
+  /* l */ {  3, 10, 13, 17, 18, 22, 25, 30,  0,  0,  0, 32, 35, 38, 42, 48,  0, 50, 59, 51, 52, 56, 58,  0,  0,  0 },
   /* m */ {  1,  0,  0,  0,  7,  0,  0,  0,  0,  0, 10,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0, 16 },
   /* n */ {  0,  1,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  5,  8, 10,  0,  0,  0,  0,  0, 17,  0,  0,  0,  0,  0 },
   /* o */ {  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  1,  2,  5,  0,  0,  0,  0,  0,  0,  9,  0, 11,  0,  0,  0 },
@@ -69,4 +69,4 @@
   /* z */ {  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0 }
 };
 
-static const int command_count = 550;
+static const int command_count = 554;