* command-ssh.c (ssh_key_to_sexp_buffer): New argument: comment;
integrate into S-Exp.
(ssh_identity_register): New argument: comment; pass to
ssh_key_to_sexp_buffer().
(ssh_handler_add_identity): Pass comment to
ssh_identity_register().
(ssh_identity_register): Allocate description dynamically, insert
comment; new variable: description_length; removed variable: i.
(data_sign): Do not calculate key grip for integration in
description; removed variable: i.
* findkey.c (modify_description): New function.
(agent_key_from_file): New variables: comment, comment_sexp,
comment_length, desc_text_modified; extract comment from S-Exp,
pass modified version to unprotect().
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