Bugfix and Improvements on encoding probe

[Wang Hoi]

2009/3/28 Wang Hoi <zealot.hoi at gmail.com>:
> 1. isLatin() return true (to skip probe these encodings: ucs4,utf-16
> le/be, and this is the situation that prober can work correctly )
> 2. while isLain() return false(single byte encoding), AND
> errorsIfUtf8() return true ( to be sure that it's 100% not utf-8 ),

Sorry, a mistake
#2 is while isLain() return true(single byte encoding), not false..........