[PATCH] Add third argument to sort (same as third argument to call())

[ZyX]

The attached patch adds a third argument to sort so that sort will be able to 
use dictionary functions. Here are two reasons for doing this:
1. Anonymous functions are only dictionary functions (this is what I need).
2. You will be able to pass additional arguments or store some static values in 
this dictionary without using some global variable (and this is why I prefer 
this over adding `nodict' extra argument to ex_function).

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