VBA_orth checking for NaN values

[NicolasClairis]

It would be good to add a line to check for NaN values in the VBA_orth function
Something like

if nonzeros( isnan(A) )
error('your matrix should not include any NaN value');
end

at the start of the script because otherwise any parasite NaN value will create a column full of NaN in the output possibly messing with other scripts afterwards.

[lionel-rigoux]

Fixed by 072682f

[NicolasClairis]

Thanks!