Classpath: Move JUnit after JMockit

Fixes unit test failures.
AbstractFileProtocolTest: Fix testReadBinaryTooLong()

This is not an error case; the result is just a warning code. The data
(up to the end of the file) should still be read and sent back.
AbstractFileProtocol: Fix processCommandReadBinary() long reads

When more bytes are requested than available, the status should be
0x6282, but the available data should still be read and sent back.

Gets PIN management working with AutentApp2 and seems to get AusweisApp
a bit further in the authentication process.
Merge pull request #8 from weinhold/fix-read-binary

Fix AbstractFileProtocol.processCommandReadBinary() handling of short reads