Log Message:
Update to 5.1u.

Source Changes from TDE 5.1t to TDE 5.1u
    * VC project file, thanks to David Hughes;
    * modified dirlist.c to allow for other list dialogs, using new type \ 
structure LIST. 
Source Changes from TDE 5.1s to TDE 5.1t
    * quicksort and insertion sort have been defined out, replaced with a \ 
quicker mergesort.