misc lispusers changes -- UNIXYCD, lsee (#889)

* Move cd, ls, pwd to it's own little lispusers (needs documentation)

* add .TXT documentation, also patch lsee script to translate ^ and _ to up and left arrow

* Add document for CONDITIONGRAPH

lispusers/UNIXYCD.TXT

@@ -0,0 +1,13 @@
+	UNIXYCD & .LCOM .TXT
+
+
+This file implements little commands:
+
+cd               change Lisp's current directory to home
+cd dir           dir can be a path separated by / or >.
+                 if no "hostname" is given, it's assumed {DSK}
+ls [dir]         list current directory or a directory that's given
+                 non-feature: ls foo only prints foo; you need to
+		 specify        ls foo/
+pwd		 print working directory
+