rename log() into logit() to avoid name conflict. markus ok, from netbsd

ssh-add -c, prompt user for confirmation (using ssh-askpass) when
private agent key is used; with djm@; test by dugsong@, djm@; ok deraadt@

don't connect to agent to test for presence if we've previously
connected; ok markus@

unnecessary cast

KNF done automatically while reading....

remove the CONSTRAIN_IDENTITY messages and introduce a new
ADD_ID message with contraints instead. contraints can be
only added together with the private key.

fix stupid typo

break agent key lifetime protocol and allow other contraints for key usage.

ssh-add -t life, Set lifetime (in seconds) when adding identities; ok provos@

ssh-add -x for lock and -X for unlocking the agent.
todo: encrypt private keys with locked...

Add PIN-protection for secret key.

signed vs. unsigned: make size arguments u_int, ok stevesk@

unneeded cast cleanup; ok markus@

minor KNF

use sizeof addr vs. SUN_LEN(addr) for sockaddr_un. Stevens blesses
this and we do it this way elsewhere. this helps in portable because
not all systems have SUN_LEN() and sockaddr_un.sun_len. ok m

use sizeof addr vs. SUN_LEN(addr) for sockaddr_un. Stevens blesses
this and we do it this way elsewhere. this helps in portable because
not all systems have SUN_LEN() and sockaddr_un.sun_len. ok markus@

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extended failure messages from galb@vandyke.com

use strings instead of ints for smartcard reader ids

initial support for smartcards in the agent

more strict prototypes. raise warning level in Makefile.inc. markus ok'ed
TODO; cleanup headers

use xxx_put_cstring()

fix whitespace: unexpand + trailing spaces.

EINTR/EAGAIN handling is required in more cases

log functions should not be passed strings that end in newline as they
get passed on to syslog() and when logging to stderr, do_log() appends
its own newline.

split line so that p will have an easier time next time around

unexpand and remove end-of-line whitespace; ok markus@