innobase/data/data0type.c:
  Add mbminlen and mbmaxlen to dtype_t
innobase/include/data0type.h:
  Add mbminlen and mbmaxlen to dtype_t
  Add dtype_get_mbminlen() and dtype_get_mbmaxlen()
innobase/include/data0type.ic:
  Add dtype_set_mblen()
  Add dtype_get_mbminlen() and dtype_get_mbmaxlen()
  Replace innobase_is_mb_cset() with innobase_get_mb_cset()
innobase/include/row0mysql.h:
  Add mbminlen and mbmaxlen
innobase/include/row0mysql.ic:
  Detect UCS2 collations based on mbminlen
innobase/row/row0sel.c:
  Detect UCS2 collations based on mbminlen
sql/ha_innodb.cc:
  Replace innobase_is_mb_cset() with innobase_get_mb_cset()
  build_template(): Initialize templ->mbminlen and templ->mbmaxlen