Preview clue extraction rules

By now, all have been done to define clue extraction rules. If the user want to verify the rules, he can preview them via pushing viewSCE button on the work board.

After the viewSCE button has been pushed, the SCE instruction file is shown in the SCE Editor tab window of the Output region. The left column of the window is an editor. It should be paid attention that the modifications in the editor could not be uploaded onto the DataStore server.