Moved most files into private directory.

Modified main.rkt, picturing-programs.scrbl, and test-docs-complete
to reflect the new locations.

collects/picturing-programs/main.rkt

@@ -1,16 +1,16 @@
 #lang racket/base
 (require 2htdp/universe
          (only-in htdp/error check-arg)
-         picturing-programs/tiles
-	 picturing-programs/io-stuff
-	 picturing-programs/map-image
-         picturing-programs/book-pictures)
+         picturing-programs/private/tiles
+	 picturing-programs/private/io-stuff
+	 picturing-programs/private/map-image
+         picturing-programs/private/book-pictures)
 
-(provide (all-from-out picturing-programs/tiles)   ; includes all-from-out 2htdp/image, plus a few simple add-ons
-         (all-from-out picturing-programs/io-stuff) ; includes with-{input-from,output-to}-{string,file}, with-io-strings
-	 (all-from-out picturing-programs/map-image)
+(provide (all-from-out picturing-programs/private/tiles)   ; includes all-from-out 2htdp/image, plus a few simple add-ons
+         (all-from-out picturing-programs/private/io-stuff) ; includes with-{input-from,output-to}-{string,file}, with-io-strings
+	 (all-from-out picturing-programs/private/map-image)
 	; includes (map,build)(3,4,)-image,  real->int, name->color, colorize, get-pixel-color
-         (all-from-out picturing-programs/book-pictures) ; pic:calendar, pic:hacker, etc.
+         (all-from-out picturing-programs/private/book-pictures) ; pic:calendar, pic:hacker, etc.
 	 (all-from-out 2htdp/universe)
 	 show-it)
 

collects/picturing-programs/picturing-programs.scrbl

@@ -69,7 +69,7 @@ model is exactly what should be displayed in the animation window:
 
 @section{New image functions}
 @; @defmodule*/no-declare[(picturing-programs/tiles)]
-@declare-exporting[picturing-programs/tiles picturing-programs]
+@declare-exporting[picturing-programs/private/tiles picturing-programs]
 
 @defproc[(rotate-cw [img image?])
          image?]{Rotates an image 90 degrees clockwise.}
@@ -119,7 +119,7 @@ compatibility.}
 @section{Variables}
 
 @; @defmodule*/no-declare[(picturing-programs/book-pictures)]
-@declare-exporting[picturing-programs/book-pictures picturing-programs]
+@declare-exporting[picturing-programs/private/book-pictures picturing-programs]
 
 This teachpack also defines variable names for some of the pictures used in the textbook.
 
@@ -143,7 +143,7 @@ particular, there's no requirement that your names start with "pic:".
 @section{Pixel functions}
 
 @; @defmodule*/no-declare[(picturing-programs/map-image)]
-@declare-exporting[picturing-programs/map-image picturing-programs]
+@declare-exporting[picturing-programs/private/map-image picturing-programs]
 
 
 The above functions allow you to operate on a picture as a whole, but sometimes
@@ -354,7 +354,7 @@ The version using @racket[good-gradient] works.}
 @section{Input and Output}
 
 @; @defmodule*/no-declare[(picturing-programs/io-stuff)]
-@declare-exporting[picturing-programs/io-stuff picturing-programs]
+@declare-exporting[picturing-programs/private/io-stuff picturing-programs]
 
 
 This teachpack also provides several functions to help in testing

collects/picturing-programs/tests/test-docs-complete.rkt

@@ -1,7 +1,7 @@
 #lang racket/base
 (require tests/utils/docs-complete)
-(check-docs (quote picturing-programs/tiles))
-(check-docs (quote picturing-programs/map-image))
+(check-docs (quote picturing-programs/private/tiles))
+(check-docs (quote picturing-programs/private/map-image))
 (check-docs (quote picturing-programs))
-(check-docs (quote picturing-programs/io-stuff))
-(check-docs (quote picturing-programs/book-pictures))
+(check-docs (quote picturing-programs/private/io-stuff))
+(check-docs (quote picturing-programs/private/book-pictures))