- The Oracle dialect will issue VARCHAR type definitions

- The Oracle dialect will issue VARCHAR type definitions
using character counts, i.e. VARCHAR2(50 CHAR), so that
the column is sized in terms of characters and not bytes.
Column reflection of character types will also use
ALL_TAB_COLUMNS.CHAR_LENGTH instead of
ALL_TAB_COLUMNS.DATA_LENGTH.  Both of these behaviors take
effect when the server version is 9 or higher - for
version 8, the old behaviors are used.  [ticket:1744]