data(hanja): words, not only syllables

The import kept only readings of one syllable, so the Hanja search could
convert 한 but never 한자, 학교, or 대한민국 — the conversion every other
Korean input method offers.  libhangul's table has 187k readings; both
scripts now keep them all, and the search finds a word as readily as a
syllable.  The daemon pays for it: 24 MB instead of 12, and 170 ms to
start instead of 30.

README.md

@@ -58,8 +58,11 @@ typed keys, and what they spell in the current language, against a prefix
 of every emoji's CLDR name and keywords in English, Korean, and Japanese,
 and against ASCII symbol aliases such as `->` and `<=`. `Ctrl+H` takes the
 syllable being composed as its query and composes on from it; `Esc` gives
-the syllable back; the Hanja dictionary lists one modern Hangul syllable at
-a time. Leaving the field or clicking elsewhere commits what is pending.
+the syllable back. The Hanja dictionary converts a word as well as a
+syllable, so `Ctrl+H` and then 한자 gives 漢字, and 대한민국 gives 大韓民國;
+a syllable already committed is the application's text, not the engine's,
+and cannot be converted. Leaving the field or
+clicking elsewhere commits what is pending.
 
 ## Preedit and candidates