ver 3.0.6
* Support cairo for text rendering. (Experimental)
  (See doc/en/README.cairo in detail.)
* Support searching text in terminal screen. (Add "mlsearch.sh" tool.)
* "CSI < r", "CSI < s" and "CSI < t" sequences are supported.
* Improve cursor movement in bi-direction text.
* Improve compatibility of libvte. (Gtkterm2, evilvte and sakura work.)
* Ignore all spaces at the end of lines in selecting text regardless of their
  fg/bg colors.
* Support unicode indic characters (using ISCII fonts though). (Experimental)
* Other bug fixes:
  Fix a mistake which disabled configuration in $prefix/etc/mlterm in libvte.