bug#20385: [PROPOSED PATCH] Support quoting 'like this' in doc strings

[Paul Eggert]

Stefan Monnier wrote:
> But yes, `...' is ugly.  It used to be pretty back in the XFree86<4.0
> days, when they were symmetric

And before that, some character-based video display terminals displayed `...' 
nicely.  There was good technical justification for this, as the 1965 draft 
definition of ASCII said 0x27 was the code for an opening single quotation mark. 
 However, standardization headed in a different direction long ago and nowadays 
`...' is ugly everywhere.  For more of the history, please see:

Kuhn M. ASCII and Unicode quotation marks (2007).
http://www.cl.cam.ac.uk/~mgk25/ucs/quotes.html