Boost field buffer size - crashes when trying to draw very deep UTF-8 trees

Test by nesting 30 shells
Patch from ArchLinux. Closes #65.

Process.c

@@ -469,7 +469,7 @@ static inline void Process_outputRate(RichString* str, int attr, char* buffer, i
 }
 
 static void Process_writeField(Process* this, RichString* str, ProcessField field) {
-   char buffer[128]; buffer[127] = '\0';
+   char buffer[256]; buffer[255] = '\0';
    int attr = CRT_colors[DEFAULT_COLOR];
    int baseattr = CRT_colors[PROCESS_BASENAME];
    int n = sizeof(buffer) - 1;