Korean tables: greatly restructured table set.

In 2006, Institue for Korean Braille modified some dots in Korean braille. Specifically, some punctuation dots are now based on English. To accomodate this change and to retain the old tables, the Korean table set was revised as follows:
* Added three files: ko-chars, the Korean characters dictionary, and rules for g1 and g2.
* ko-g1 and ko-g2 are now interface files that includes needed files.
* Added three files for Korean braille 2006 revision along with a test harness.
More modifications to be done soon.