Problem:    Tables for Unicode case operators are outdated.
Solution:   Add a Vim script for generating the tables.  Include tables for
            Unicode 5.2.

Problem:    "g_" doesn't position cursor correctly when in Visual mode and
            'selection' is "exclusive". (Ben Fritz)
Solution:   Call adjust_for_sel().

Problem:    has("win64") does not return 1 on 64 bit MS-Windows version.
Solution:   Also check for _WIN64 besides WIN64.