Fix: using charset-aware functions cs->cset->lengthsp() and cs->cset->fill()
  instead of single byte code which is not UCS2 compatible.


myisam/mi_key.c:
  Using character-set aware functions to trim and append spaces.
myisam/mi_open.c:
  Initialize charset for BINARY/VARBINARY to my_charset_bin,
      instead of NULL
mysql-test/r/ctype_ucs.result:
  Adding test case
mysql-test/t/ctype_ucs.test:
  Adding test case