Assorted internal and external URL fixes

i2p2www/pages/site/about/performance/history.html

@@ -9,13 +9,14 @@ for current issues and thoughts.
 
 <h2>{{ _('Native math') }}</h2>
 <b>[{{ _('implemented') }}]</b>
-<p>{% trans modpow='http://java.sun.com/j2se/1.4.2/docs/api/java/math/BigInteger.html#modPow(java.math.BigInteger,%20java.math.BigInteger)',
+<p>{% trans modpow='http://docs.oracle.com/javase/1.4.2/docs/api/java/math/BigInteger.html#modPow(java.math.BigInteger,%20java.math.BigInteger)',
+gmp='http://gmplib.org/',
 jbigi=site_url('misc/jbigi') -%}
 When I last profiled the I2P code, the vast majority of time was spent within
 one function: java.math.BigInteger's
 <a href="{{ modpow }}">modPow</a>.
 Rather than try to tune this method, we'll call out to
-<a href="http://www.swox.com/gmp/">GNU MP</a> - an insanely fast math library
+<a href="{{ gmp }}">GNU MP</a> - an insanely fast math library
 (with tuned assembler for many architectures). (<i>Editor: see
 <a href="{{ jbigi }}">NativeBigInteger for faster public key cryptography</a></i>)
 {%- endtrans %}</p>