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Remove extraneous underscores at start and end of Rectangles seeds.

[originally from svn r4473]

--- a/rect.c

+++ b/rect.c

@@ -881,7 +881,13 @@

                     run -= c - ('a' - 1);

                 }

             } else {

-                *p++ = '_';

+                /*

+                 * If there's a number in the very top left or

+                 * bottom right, there's no point putting an

+                 * unnecessary _ before or after it.

+                 */

+                if (p > seed && n > 0)

+                    *p++ = '_';

             }

             if (n > 0)

                 p += sprintf(p, "%d", n);