Rewrite the UBI wear-leveling unit and Implemented two-dimension(PEB ec, LEB temp) wear leveling algorithm.

Hello,

I've finished the two-dimension wear-leveling algorithm. which is good enough for not only wear-leveling but also reduce unnecessary erasure among the wear-leveling process as soon as possible,due to the two-dimension(PEB erase counter, LEB temperature) wear leveling algorithm.

It's too long to send the diff in the mail-list.

Look at the source for the details in the git tree 'projects / users/dedekind/ubi-2.6.git /'

good day.

Yours sincerely
xiaochuan-xu(cqu.edu.cn)