Make a fix suggested during beta testing: you can read scrolls while
blind if you know the label, and you can write a scroll with a magic
marker while blind, but the result was flagged as description unknown
so you couldn't read the newly written scroll until regaining sight
or obtaining object identification. So change writing a previously
discovered scroll while blind to set dknown since a successful write
always yields the type of scroll requested. Getting lucky while
attempting to write an undiscovered scroll--which has to be done by
scroll's type name (for instance "food detection") rather than by its
label ("YUM YUM")--still leaves the description flagged as unknown
since hero hasn't seen the what sort of label the new scroll has.
Along the way I got side-tracked by the possibilty of writing a scroll
of mail. It's allowed and yielded the same result as finding such a
scroll in bones, or wishing for one: when read, it was junk mail from
Larn. Make one written via marker give different feedback since it
comes from creation of a stamped scroll without any stamps available.
Also, suppress an "argument not used" warning for readmail().
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