Lots of changes:

Lots of changes:

 - Removed lots of unnecessary checks from autoconf
 - Added support and autoconf test for openpty() function (Unix98 pty support)
 - Fix for scp not finding ssh if not installed as /usr/bin/ssh
 - Added TODO file
 - Merged parts of Debian patch From Phil Hands <phil@hands.com>:
   - Added ssh-askpass program
   - Added ssh-askpass support to ssh-add.c
   - Create symlinks for slogin on install
   - Fix "distclean" target in makefile
   - Added example for ssh-agent to manpage
   - Added support for PAM_TEXT_INFO messages
   - Disable internal /etc/nologin support if PAM enabled
 - Merged latest OpenBSD CVS changes:
   - [sshd.c] don't send fail-msg but disconnect if too many authentication
     failures
   - [sshd.c] replace assert() with error, fatal or packet_disconnect
   - [sshd.c] remove unused argument. ok dugsong
   - [sshd.c] typo
   - [rsa.c] clear buffers used for encryption. ok: niels
   - [rsa.c] replace assert() with error, fatal or packet_disconnect
 - Fixed coredump after merge of OpenBSD rsa.c patch