Russian language environment

Support for Russian using koi8-r and the russian-computer input method.

Sample text:
  Russian (Русский)	Здравствуйте!

Input methods (default russian-computer):
  russian-computer ("RU" in mode line)
  cyrillic-jcuken ("ЖЙ" in mode line)
  russian-typewriter ("ЖЙ" in mode line)

Character sets:
  cyrillic-iso8859-5: Right-Hand Part of Latin/Cyrillic Alphabet (ISO/IEC 8859-5): ISO-IR-144.

Coding systems:
  cyrillic-koi8 (`R' in mode line):
	KOI8-R 8-bit encoding for Cyrillic (MIME: KOI8-R).
	(alias: cyrillic-koi8 koi8-r koi8 cp878 x-koi8-r koi8-u x-koi8-u)