Config option for disabled SSL protocols (#720)

In the global config section:
SSLDisabledProtocol = <value1>
SSLDisabledProtocol = <value2>
...

Available values are: None, SSLv2, SSLv3, TLSv1
It takes any combination of:

````
	enum EDisableProtocol
	{
		EDP_None		= 0, //!< disable nothing
		EDP_SSLv2		= 1, //!< disable SSL verion 2
		EDP_SSLv3		= 2, //!< disable SSL verion 3
		EDP_TLSv1		= 4, //!< disable TLS verion 1
		EDP_SSL			= (EDP_SSLv2|EDP_SSLv3)
	};
````