missing el_div and el_ldiv operators for integer types

[David Bateman]

It appears that

int8(1) ./ int8([1, 0])
int8([1,0]) .\ int8(1)
int8([1,0]) .\ int8([1,1])
int8([1,0]) ./ [1,0]

all result in missing operators when they shouldn't.. The attached patch
addresses this.. There are perhaps other issues with missing integer
operators that we haven't found yet however, and so perhaps some test
code is in order..

D.
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