Download hmd.e0 of all countries and years

[rafapereirabr]

Hi Rob,

I was wondering if it would be possible to download life expectancy at birth data from all countries in all years available. I do not know how to implement theses features in the library, but they would certainly be very welcomed !

hmd.e0( country= "ALL"
               , years= "ALL"
               , username= "myusername"
               , password= "mypswd")