`SiteSet(int)` constructor does not work

[mtfishman]

The SiteSet documentation page (http://www.itensor.org/docs.cgi?vers=cppv3&page=classes/siteset) says you can do SiteSet(N) to get a generic SiteSet with N sites, but I don't think it works. Maybe it should default to SiteSet(2,N) SiteSet(N,2)?

[emstoudenmire]

I'd suggest let's just update the documentation. My feeling is that one always knows the size "d" of the local sites one wants, so no need for a default of 2.

[mtfishman]

Sounds good to me.