"Use left file except marked blocks" -> "Leave only marked blocks"

Based on TortoiseSVN revision 25294

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
Remove wrong cast

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
Can undo mark block

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
TMerge save marked blocks

This continues http://tortoisesvn.tigris.org/ds/viewMessage.do?dsForumId=757&dsMessageId=3074458

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>