validate SSL certificate hostname (#167).
fixed freeze bug on STARTTLS.
prohibit acception of expired SSL certificates.
src/sslmanager.c: display issued and expire date. Refined text format.
calculate and display SHA1/MD5 fingerprint if verification of SSL certificate failed.
added the feature to save SSL peer certificate and always accept it.
fixed crash on Win32 when an OpenSSL DLL linked with MSVCR71.DLL was used.
ssl_manager_verify_cert(): follow comply_gnome_hig setting.
implemented SSL certificate dialog.