PATCH: [perl #75548], revised [perl #74702], \N{} handling

This email is sort of an experiment to see how RT handles two different 
ticket numbers in the subject line.  I was tempted to include more, but 
decided I'd better wait.

Now that we are sending patches to perlbug in order to generate a ticket 
number, so they don't get lost, it creates a bit of a dilemma if you 
have patches to more than one ticket, but they need to be applied in a 
certain order.  So that's what I'm trying here.

This is a series of commits, all to do with charnames.pm.  The first one 
was submitted, but hasn't been applied yet, and I think it may no longer 
cleanly apply to blead; so I'm resubmitting it, and at the same time, I 
modified it slightly to take advantage of the new EBCDIC functionality 
in test.pl.

The others are mostly tiny; except one commit adds a number of aliases 
for \N{} to understand.

The final one fixes the problem of viacode returning the least desirable 
name when there are multiple possibilities.

I have more fixes to add to charnames, but will stop at two ticket 
numbers in the same email.

• PATCH: [perl #75548], revised [perl #74702], \N{} handling by karl williamson