Changes to Z:

4/9/92 ---------------- Released v5.2a beta 1 ------------------------
9/17/92 jd: termpc.c, colon.c
	Added support for vga 50-line mode. 
	New command- :se 50={1|0}

10/4/92 ---------------- Released v5.2a beta 2 ------------------------

10/14/92 jd: dobang()
	Before executing an external program for the :! command, z now clears
	the screen and homes the cursor.