[Swan-dev] diagnostics from confread

[D. Hugh Redelmeier]

I've just pushed an improvement in how confread handles diagnostics.

Test testing/pluto/ikev2-asymmetric-01-parsing will now fail.  I don't 
know what we should hope for here.  Some errors are being reported by
two different mechanisms.  I don't know which report to eliminate.

I've been told that in some cases confread errors just disappear.  Can
someone remind me when and why this happens?  I think that these
changes may make it easy to fix this.