- (djm) Sync with V_3_7 branch:

 - (djm) Sync with V_3_7 branch:
   - (djm) Fix SSH1 challenge kludge
   - (djm) Bug #671: Fix builds on OpenBSD
   - (djm) Bug #676: Fix PAM stack corruption
   - (djm) Fix bad free() in PAM code
   - (djm) Don't call pam_end before pam_init
   - (djm) Enable build with old OpenSSL again
   - (djm) Trim deprecated options from INSTALL. Mention UsePAM
   - (djm) Fix quote handling in sftp; Patch from admorten AT umich.edu