(CLIENT_PROTOCOL_VERSION): Likewise.
(SERVER_VERSION_LINE): New constant.
(CLIENT_VERSION_LINE): Likewise.
Updated all users.

Rev: src/lsh-transport.c:1.15
Rev: src/lsh.c:1.220
Rev: src/lshd-connection.c:1.11
Rev: src/lshd-userauth.c:1.13
Rev: src/version.h:1.14