Client server protocol

Change simulation to enable client-server protocols. Current implementation is a particular (primitive) instance of it. Special care for FH-OPE (min and max ciphers) and LewiORE (left-right framework).

Also track communication overhead (see #29 (closed)).

Need to do:

• Ruby scripts
• Concise output
• Use generic out T construction on schemes
• LewiORE and FH-OPE protocols properly calling virtual methods

Need to test:

• Sizes for ciphers and keys
• FHOPE state operations
• Protocols
• Simulator
• FH-OPE state imperfect