#2849 limit(ind*XXX) and limit(ind/XXX) gives errors rather than results

[Stavros Macrakis]

limit(X) where X is one of the expressions below gives the error "sign of ind is undefined". But "und" is a better answer for all these cases (since ind can include positive, negative, and zero)

ind*inf 
inf/ind 
ind*minf 
minf/ind 
ind*inf 
ind/inf 
ind*minf 
ind/minf 

[Stavros Macrakis]

In fact, single-argument limit isn't doing much at all with ind:

limit(ind+1) => ind+1 -- should be ind
limit(ind^2) => ind^2 -- should be ind
limit(1/ind) => 1/ind -- should be und

etc.