[RFC/RFA] Add handling for unqualified Ada operators in linespecs

[Keith Seitz]

On 12/16/2011 11:29 AM, Tom Tromey wrote:
> I don't even mind that as a temporary measure.  But I think (or hope)
> Keith's plan is for single- and double-quotes to be considered
> identically, and uniformly, throughout linespec.

Wanting to simplify this as much as possible, I eliminated the 
double-quote. The choice was rather arbitrary, and it can be added or 
changed rather easily.

Keith