ver 3.1.0
* Support extended mouse tracking mode. (CSI ? 1005 h and CSI ? 1005 l)
* Support "use_variable_column_width" and "letter_space" options in win32.
* Support multiple numeric parameters of SM, RM, DECSET and DESRST sequence.
  (Thanks to Iwamoto Kouichi san)
* Support BiDi mirroring. (Thanks to Khaled Hosny)
* Add "blink_cursor" option.
* Add "inner_border" option.
* Add "bd_color"(rxvt style) and "ul_color" options. (equivalent to colorBD and colorUL
  options of xterm and rxvt.)
* Add "cipher_list" for ssh connection.
* Add java version. (experimental)
* Add VT52 emulation. (configure with --enable-vt52 option.)
* Remove IIIMF plugin.
* Bug fixes:
  SF Bug #2878878 (Thanks to Kusanagi Kouichi san)
  SF Bug #3481552 (Thanks to Kobayashi Hiroaki san)
  SF Bug #3487163 (Thanks to raghavkrishna)
  SF Bug #3509743 (Thanks to Thomas Wolff)
  SF Bug #3509744 (Thanks to Thomas Wolff)
  SF Bug #3512067 (Thanks to phcoder)
  Fix a bug which didn't clear margin area after visual bell.
  Fix a bug which disabled scrolling in vertical mode in win32.
  Fix a bug which disabled wheel mouse in win32.
  Fix a bug of reverse-video algorithm of highlighted cursor or selected text.
  (Thanks to Andi Cristian Serbanescu)