Test method (for example):
  $ ptex -ini -kanji=euc -ini qtrip   > qtrip-p1.log
  $ ptex -fmt=qtrip -kanji=euc qtrip  > qtrip-p2.log
  $ ptex.old -ini -kanji=euc -ini qtrip  > qtrip-po1.log
  $ ptex.old -fmt=qtrip -kanji=euc qtrip > qtrip-po2.log
  $ diff -ud qtrip-p1.log qtrip-po1.log
  $ diff -ud qtrip-p2.log qtrip-po2.log
# The option "-kanji=euc" is essential.
