Comparison of multidimensional associative arrays

[Alexander Zhirov]

Not an easy task for me, maybe you can advise your compact 
solution. There are two associative arrays of type 
`string[string][int]`. It is necessary to find the differences 
and return them when comparing:

```d
[
     6:["id":"6", "deleted":"f", "name":"6.2_test"],
     5:["id":"5", "deleted":"f", "name":"5.6_test"],
     4:["id":"4", "deleted":"f", "name":"6.2_hwlister"],
     3:["id":"3", "deleted":"f", "name":"5.6_hwlister"],
     2:["id":"2", "deleted":"f", "name":"6.2"],
     1:["id":"1", "deleted":"f", "name":"5.6"]
]

[
     4:["id":"4", "deleted":"f", "name":"6.2_hwlister"],
     3:["id":"3", "deleted":"f", "name":"5.6_hwlister"],
     2:["id":"2", "deleted":"f", "name":"6.2"],
     1:["id":"1", "deleted":"f", "name":"5.6"]
]
```