Update the links to the FIPS document that defines the Secure Hash

Algorithm.  This closes SF bug #454917.

Doc/lib/libsha.tex

@@ -66,12 +66,13 @@ substring.
 \end{methoddesc}
 
 \begin{seealso}
-  \seetitle[http://csrc.nist.gov/fips/fip180-1.txt]{Secure Hash Standard}{
-            The Secure Hash Algorithm is defined by NIST document FIPS
+  \seetitle[http://csrc.nist.gov/publications/fips/fips180-1/fip180-1.txt]
+    {Secure Hash Standard}
+    {The Secure Hash Algorithm is defined by NIST document FIPS
      PUB 180-1:
-            \citetitle[http://csrc.nist.gov/fips/fip180-1.txt]{Secure
-            Hash Standard}, published in April of 1995.  It is
+     \citetitle[http://csrc.nist.gov/publications/fips/fips180-1/fip180-1.txt]
+        {Secure Hash Standard}, published in April of 1995.  It is
      available online as plain text (at least one diagram was
      omitted) and as PDF at
-            \url{http://csrc.nist.gov/fips/fip180-1.pdf}.}
+     \url{http://csrc.nist.gov/publications/fips/fips180-1/fip180-1.pdf}.}
 \end{seealso}