Added SILC errno API. Added SilcResult, generic error code and

	return value type.  Added global silc_errno that returns last
	error in that thread.

	Deprecated SilcSocketStreamStatus, SilcResult replaces it.
	Backwards support remains.

	Deprecated SilcNetStatus, SilcResult replaces it.  Backwards
	support remains.

	Added errno setting to almost all Runtime Tooolkit routines
	in error conditions.