Replace bare "unsigned" as a type name with "unsigned int"

Replace bare "unsigned" as a type name with "unsigned int"

I noticed some occasions where my attempts at 16-bit cleanliness had
failed because I hadn't noticed that "unsigned" was a species of "int"
and hence potentially only 16 bits.  So now I'm trying to be more
explicit and saying "unsigned int".

Next several of them will need to be replaced with something else.