Change autopickup and color default values

Change the default value of autopickup to off. Having it on is
harmful for new players, making them very easily burdened.
We can't expect new players to know how to configure
pickup_types, pickup_burden, and pickup exceptions.

Change the default value of color to on. We can safely assume
new users have a terminal that supports color, and most people
want color.

doc/Guidebook.tex

@@ -2461,10 +2461,9 @@ location ordinarily wouldn't be seen any more.
 
 %.pg
 When you find something in the dungeon, it is common to want to pick
-it up.  In {\it NetHack}, this is accomplished automatically by walking over
-the object (unless you turn off the {\it autopickup\/}
-option (see below), or move with the `{\tt m}' prefix (see above)), or
-manually by using the `{\tt ,}' command.
+it up.  In {\it NetHack}, this is accomplished by using the `{\tt ,}' command.
+If {\it autopickup\/} option is on, you will automatically pick up the object
+by walking over it, unless you move with the `{\tt m}' prefix.
 %.pg
 If you're carrying too many items, {\it NetHack\/} will tell you so and you
 won't be able to pick up anything more.  Otherwise, it will add the object(s)
@@ -3837,7 +3836,7 @@ Walking into a closed door attempts to open it (default true).
 Persistent.
 %.lp
 \item[\ib{autopickup}]
-Automatically pick up things onto which you move (default on).
+Automatically pick up things onto which you move (default off).
 Persistent.
 \\
 %.lp ""
@@ -4776,8 +4775,7 @@ Setting {\tt ascii\verb+_+map} to {\it True\/} forces
 %.lp
 \item[\ib{color}]
 If {\it NetHack\/} can, it should display color for different monsters,
-objects, and dungeon features.
-
+objects, and dungeon features (default on).
 %.lp
 \item[\ib{eight\verb+_+bit\verb+_+tty}]
 Pass eight-bit character values (for example, specified with the