* libwget/ssl_gnutls.c: Do not skip automatic library initialization
* libwget/md5.c (wget_md5_printf_hex): Print message on error
* tests/test.c: New tests for hashing functionality
GnuTLS automatically initializes on application startup.
This wastes CPU cycles when not using HTTPS.
Switched off, simple functionality like MD5 fail (needed for metalink and
authorization). We have to implement hashing via -lcrypt or -lgcrypt
later - and than we could use GNUTLS_SKIP_GLOBAL_INIT again.