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Add 3x3 Trivial to the presets list, and make it the default.

[originally from svn r5757]

--- a/solo.c

+++ b/solo.c

@@ -116,7 +116,7 @@

     ret->c = ret->r = 3;

     ret->symm = SYMM_ROT2;	       /* a plausible default */

-    ret->diff = DIFF_SIMPLE;           /* so is this */

+    ret->diff = DIFF_BLOCK;	       /* so is this */

     return ret;

 }

@@ -141,6 +141,7 @@

     } presets[] = {

         { "2x2 Trivial", { 2, 2, SYMM_ROT2, DIFF_BLOCK } },

         { "2x3 Basic", { 2, 3, SYMM_ROT2, DIFF_SIMPLE } },

+        { "3x3 Trivial", { 3, 3, SYMM_ROT2, DIFF_BLOCK } },

         { "3x3 Basic", { 3, 3, SYMM_ROT2, DIFF_SIMPLE } },

         { "3x3 Intermediate", { 3, 3, SYMM_ROT2, DIFF_INTERSECT } },

         { "3x3 Advanced", { 3, 3, SYMM_ROT2, DIFF_SET } },

@@ -164,6 +165,7 @@

     ret->c = ret->r = atoi(string);

     ret->symm = SYMM_ROT2;

+    ret->diff = DIFF_BLOCK;

     while (*string && isdigit((unsigned char)*string)) string++;

     if (*string == 'x') {

         string++;