Fixed a defect in iosrv.exe that caused a panic if a foreground read object was attached to a different end point. This was due to the read object being notified of a change in foreground before its iEndPoint member was updated. This member is now updated before attempting the attach, and is set to NULL in the event of a leave (resulting in the read object being left in an unattached state). Also tweaked ymodem.cif to make it more readable.

EXPORTS
	?ImplementationGroupProxy@@YAPBUTImplementationProxy@@AAH@Z @ 1 NONAME ; struct TImplementationProxy const * ImplementationGroupProxy(int &)
	?KAutoStartFshell@@3HB @ 2 NONAME ; int const KAutoStartFshell