validate SSL certificate hostname (#167).
libsylph/ssl.c: ssl_done(): check if fp != NULL.
prohibit acception of expired SSL certificates.
ssl_init_socket_with_method(): modified debug output.
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.
also look for ca-root.crt.
call SSL_CTX_load_verify_locations() also when only certs_file exists.
modified SSL CA certificates.
use X509_cmp() to compare certificates.
read /etc/ssl/certs if exist.
implemented SSL certificate dialog.
changed the license of LibSylph from GPL to LGPL.
made some core modules library (libsylph).