dpv(1) ignores -i & -I flags

By simply overwriting the provided template strings with the default 
ones a bit later.

Here's one possible fix (untested):

--- dpv.c.orig    2016-06-16 23:14:00.466195000 +0400
+++ dpv.c    2016-06-16 23:15:39.306944000 +0400
_at__at_ -455,12 +455,16 _at__at_

      /* Set status formats and action */
      if (line_mode) {
-        config->status_solo = LINE_STATUS_SOLO;
-        config->status_many = LINE_STATUS_SOLO;
+        if (!config->status_solo)
+            config->status_solo = LINE_STATUS_SOLO;
+        if (!config->status_many)
+            config->status_many = LINE_STATUS_SOLO;
          config->action = operate_on_lines;
      } else {
-        config->status_solo = BYTE_STATUS_SOLO;
-        config->status_many = BYTE_STATUS_SOLO;
+        if (!config->status_solo)
+            config->status_solo = BYTE_STATUS_SOLO;
+        if (!config->status_many)
+            config->status_many = BYTE_STATUS_SOLO;
          config->action = operate_on_bytes;
      }