eci.c: replace libiconv-adapted code with own implementations so

as to fully comply with BSD license (for why Library GPL 2+ not
  compatible see https://opensource.stackexchange.com/a/6701),
  ~3% slower (maybe), +~6K extra in data
  (gb18030.c, gb2313.c & sjis.c removed, mapping .TXT files moved
  to backend/tools/data & extra ones added, 2 new PHP generators)
GUI: CODE39/EXCODE39: show/hide HIBC check digit option in addition
  to enable/disable (less confusing)
CLI: batch: pedantic check for EOF using intChar in newline fgetc()
  loop
test_args.c: don't use WIFEXITED(), WEXITSTATUS() on Windows
manual: lessen some copy/paste verbiage by referring back, other
  small tweaks/typos

backend/qr.c

@@ -36,7 +36,6 @@
 #include "common.h"
 #include <stdio.h>
 #include "eci.h"
-#include "sjis.h"
 #include "qr.h"
 #include "reedsol.h"
 #include <assert.h>