- the old method is default: it looks for jbigi.dll / libjbigi.so in the current dir (and library path)
- otherwise, you can specify -Djbigi.impl=blah and if there is a file called "blah" in the classpath (including any jar file), it will load that file as a native implementation
there are lots more javadocs now as well, and the dependency upon Log was removed (so anyone else who wants to use this just needs NativeBigInteger.java and the jbigi implementation)
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