Added link to test.c from main API page, and doxygenified the test.c comments.

lladd/transactional.h

@@ -199,6 +199,8 @@ terms specified in this license.
    
    @endcode
 
+   @see test.c for a complete, executable example of reopeneing an existing store.
+
    @todo Explain how to determine the correct value of rootEntry.size in the case
          of a hashtable.
    

src/apps/eric/test.c

@@ -2,7 +2,10 @@
 #include <assert.h>
 #include <lladd/transactional.h>
 
-/*
+/**
+
+  @file 
+
   Basic first program
 
   Transactionally stores one integer, which is the version number of the store.