New release 1.3.72

I've tried to integrate native keystores (Windows and Mac OS x) in PortableSigner. I failed miserably. Both keystore bindings are not working correct. The code is partially in the project, but disabled!

I've cleaned up the code a little bit, upgraded both bouncycastle (now 137) and itext (now 2.05).

The program is now tested with java 1.6 under windows and mac os x.

:peter pfläging