* guile: make sure the examples still work

guile/mu/contact.scm

@@ -1,4 +1,4 @@
-(define-module (mu contact))
+(define-module (mu contact) :use-module(mu))
 (display "(mu contact) is deprecated, please remove from (use-modules ...)")
 (newline)
 

guile/mu/message.scm

@@ -1,4 +1,4 @@
-(define-module (mu message))
+(define-module (mu message) :use-module (mu))
 (display "(mu message) is deprecated, please remove from (use-modules ...)")
 (newline)
 

guile/mu/part.scm

@@ -1,4 +1,4 @@
-(define-module (mu part))
+(define-module (mu part) :use-module (mu))
 (display "(mu part) is deprecated, please remove from (use-modules ...)")
 (newline)
 

guile/mu/plot.scm

@@ -17,7 +17,7 @@
 ;; Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 
 (define-module (mu plot)
-  :use-module (mu message)
+  :use-module (mu)
   :use-module (ice-9 popen)
   :export (mu:plot))
 

guile/mu/stats.scm

@@ -18,7 +18,7 @@
 
 (define-module (mu stats)
   :use-module (oop goops)
-  :use-module (mu message)
+  :use-module (mu)
   :use-module (srfi srfi-1)
   :use-module (ice-9 i18n)
   :use-module (ice-9 r5rs)