scm automatic cleanups.
Temporarily renamed iprt/x509.h to iprt/x509-branch-collision.h to avoid trouble when merging branch code later.
x509.cpp/h: Cleaned up rtX509ReadCertificateFromPEM, please study the changes and clean up the rest.
added prefix X509 into all error definitions related to X509
Put a warning instead an error if X509 certificate is not self-signed
fixed svn properties