implement anonymous atom functions stored as atoms

@3noch proposed that atom functions could be stored namelessly as atoms and then be executed during relational expression evaluation.

Use-cases:
* equivalent to dispatch tables when used with join
* storing application logic with naming based on the function atom attribute instead of logical name

Advantages:
* obvious embarassingly parallel atom processing

Note that this takes the project into application server territory where Project:M36 is also the version control system.