Segfault from out of bounds access in @inbounds block

[cvsvensson]

Start Julia with --check-bounds=yes. A BoundsError occurs when running

partialschur(ComplexF64[1;;]) 
#ERROR: BoundsError: attempt to access 1×1 view(::Matrix{ComplexF64}, Base.OneTo(1), :) with eltype ComplexF64 index [1, 0]

which comes from the line

ArnoldiMethod.jl/src/schurfact.jl

Line 516 in 92f5094

H[from, from-1] = zero(T)

This is inside an @inbounds block and can give segfaults.

[cvsvensson]

Closed by #150.