mdds code examples

[nicholas ferguson]

>FYI, I've added some code examples for mdds::multi_type_vector
>
>http://kohei.us/files/mdds/doc/multi_type_vector.html#example
>
>which hopefully some people find useful.  I'm planning to add more code examples for multi_type_vector as well as other data >structures in mdds, but I'd like to see if there are any specific use cases for which people want to see some code examples.
>
>I'd like to hear from you if that's the case.

multi indexing.