Midgard Query Builder multilanged more

It was very frustrating experience to try to make mgd_list_xxx functions really easily working with multilanged objects. Well, it appears that such functions can not be used with ML'ed objects in real life as what you can get ( and fetch ) are objects with some lang set and additionally "the same" objects dulicated with lang 0.

I used to use ML Midgard  feature only with mgd_get_xxx functions , so midgard ML'ed fetchables became something weird.

Luckily I was able to "fix" this missed feature with Midgard Query Builder. So now , using QB all objects returned by execute method have no duplicated ( lang 0 ) ones. Additionaly you are able to limit objects and get only these ones which use particular language.

Follow midgard documentation to see how set_lang method works.

Additionally QB has count method which returns number of objects returned by query.

In theory this "should be" '$qb->count()' times faster than count($qb->execute).