Pull request from entrez: attempting to unname a unique monster or
shopkeeper by assigning a new name of <space> was rejected as
intended, but the rejection message is phrased strangely when <space>
gets inserted as the name that won't be assigned.
Fixes #917
direction prompt left a pair of stacks of 1 and N-1 with same invlet
some attack damage which shouldn't affect shades operated as intended when
hero could see it happen but erroneously affected them when not seen
+phrasing of the "you can't" message when attempting to name any monster
+ defined with a unique name or title sounded strange when rejecting
+ <space> to remove the existing name without assigning a new one
Fixes to 3.7.0-x Problems that Were Exposed Via git Repository