A very simple FileHandler which allows to view the contents of X.509 certificate files.
It displays an overview of the main properties along with the verification status.
Root certificates are considered valid all by itself if they are properly self-signed
and within their validity time period.
Non-root certificates will be considered valid only if their signer certificate(s)
can be found in the keystore which is configured in the application variable
${JceCertViewer.KeyStore}
.