Support s_client args, give -starttls example

Hi Julien, thanks for cipherscan. So far it seems to be the most compatible cipherscan tool I tried, also supporting GnuTLS targets. For bettercrypto.org I wanted to have a tool that enables us to test as many configurations as possible, also for services that aren't https - hence this change.

The argument order changed, and everything that isn't recognised as a valid $1 for cipherscan is passed on to OpenSSL.

Thanks!