Fix command line history in ash

Also did some cleanup in ash sources, to make minix modifications
more obvious, as well as some simplifications (by removing code which
is never compiled)

Removed EDITLINE support, use libedit, which does the termcap/terminfo
handling.

Change-Id: I19f7f425ed6a61298844631f9d7f3173cf7f30c0

docs/UPDATING

@@ -1,3 +1,12 @@
+20130130:
+	With the shell update, and following update of 'test', some
+	modifications are needed in .profile and .ashrc.
+	If you use the defaults, simply execute the following for all
+	of your users:
+
+	# cp etc/ast/.ashrc ~/
+	# cp etc/ast/.profile ~/
+
 20130114:
 	The terminfo update is also linked to the databases functions,
 	which means the tool used to generate the termcap entries has to