fixed bug:
   problem of refresh after create new folder or delete file(s)
17:01 2013/4/15

fixed bugs of refresh when delete or create a new file/folder;
adds key listener of LF in searchbox;
supports remembering the location of filter dialog;
fixed 130123 "only one filter view can be created at the same time";
fixed bugs of deleting folder;
adds refresh button to GlobalFileExplorer;
remember the sorting state of FolderEditor;
supports sorting filename by considering the arabic numerals in
FolderEditor;
other trivial bugs;